2 * The low performance USB storage driver (ub).
4 * Copyright (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
5 * Copyright (C) 2004 Pete Zaitcev (zaitcev@yahoo.com)
7 * This work is a part of Linux kernel, is derived from it,
8 * and is not licensed separately. See file COPYING for details.
10 * TODO (sorted by decreasing priority)
11 * -- Return sense now that rq allows it (we always auto-sense anyway).
12 * -- set readonly flag for CDs, set removable flag for CF readers
13 * -- do inquiry and verify we got a disk and not a tape (for LUN mismatch)
14 * -- verify the 13 conditions and do bulk resets
16 * -- move top_sense and work_bcs into separate allocations (if they survive)
17 * for cache purists and esoteric architectures.
18 * -- Allocate structure for LUN 0 before the first ub_sync_tur, avoid NULL. ?
19 * -- prune comments, they are too volumnous
21 * -- CLEAR, CLR2STS, CLRRS seem to be ripe for refactoring.
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/usb.h>
26 #include <linux/usb_usual.h>
27 #include <linux/blkdev.h>
28 #include <linux/timer.h>
29 #include <linux/scatterlist.h>
30 #include <scsi/scsi.h>
37 * The command state machine is the key model for understanding of this driver.
39 * The general rule is that all transitions are done towards the bottom
40 * of the diagram, thus preventing any loops.
42 * An exception to that is how the STAT state is handled. A counter allows it
43 * to be re-entered along the path marked with [C].
49 * ub_scsi_cmd_start fails ->--------------------------------------\
56 * was -EPIPE -->-------------------------------->! CLEAR ! !
59 * was error -->------------------------------------- ! --------->\
61 * /--<-- cmd->dir == NONE ? ! !
68 * ! was -EPIPE -->--------------->! CLR2STS ! ! !
71 * ! ! was error -->---- ! --------->\
72 * ! was error -->--------------------- ! ------------- ! --------->\
75 * \--->+--------+ ! ! !
76 * ! STAT !<--------------------------/ ! !
79 * [C] was -EPIPE -->-----------\ ! !
81 * +<---- len == 0 ! ! !
83 * ! was error -->--------------------------------------!---------->\
85 * +<---- bad CSW ! ! !
86 * +<---- bad tag ! ! !
92 * \------- ! --------------------[C]--------\ ! !
94 * cmd->error---\ +--------+ ! !
95 * ! +--------------->! SENSE !<----------/ !
96 * STAT_FAIL----/ +--------+ !
99 * \--------------------------------\--------------------->! DONE !
104 * This many LUNs per USB device.
105 * Every one of them takes a host, see UB_MAX_HOSTS.
107 #define UB_MAX_LUNS 9
112 #define UB_PARTS_PER_LUN 8
114 #define UB_MAX_CDB_SIZE 16 /* Corresponds to Bulk */
116 #define UB_SENSE_SIZE 18
121 /* command block wrapper */
122 struct bulk_cb_wrap
{
123 __le32 Signature
; /* contains 'USBC' */
124 u32 Tag
; /* unique per command id */
125 __le32 DataTransferLength
; /* size of data */
126 u8 Flags
; /* direction in bit 0 */
128 u8 Length
; /* of of the CDB */
129 u8 CDB
[UB_MAX_CDB_SIZE
]; /* max command */
132 #define US_BULK_CB_WRAP_LEN 31
133 #define US_BULK_CB_SIGN 0x43425355 /*spells out USBC */
134 #define US_BULK_FLAG_IN 1
135 #define US_BULK_FLAG_OUT 0
137 /* command status wrapper */
138 struct bulk_cs_wrap
{
139 __le32 Signature
; /* should = 'USBS' */
140 u32 Tag
; /* same as original command */
141 __le32 Residue
; /* amount not transferred */
142 u8 Status
; /* see below */
145 #define US_BULK_CS_WRAP_LEN 13
146 #define US_BULK_CS_SIGN 0x53425355 /* spells out 'USBS' */
147 #define US_BULK_STAT_OK 0
148 #define US_BULK_STAT_FAIL 1
149 #define US_BULK_STAT_PHASE 2
151 /* bulk-only class specific requests */
152 #define US_BULK_RESET_REQUEST 0xff
153 #define US_BULK_GET_MAX_LUN 0xfe
159 #define UB_MAX_REQ_SG 9 /* cdrecord requires 32KB and maybe a header */
160 #define UB_MAX_SECTORS 64
163 * A second is more than enough for a 32K transfer (UB_MAX_SECTORS)
164 * even if a webcam hogs the bus, but some devices need time to spin up.
166 #define UB_URB_TIMEOUT (HZ*2)
167 #define UB_DATA_TIMEOUT (HZ*5) /* ZIP does spin-ups in the data phase */
168 #define UB_STAT_TIMEOUT (HZ*5) /* Same spinups and eject for a dataless cmd. */
169 #define UB_CTRL_TIMEOUT (HZ/2) /* 500ms ought to be enough to clear a stall */
172 * An instance of a SCSI command in transit.
174 #define UB_DIR_NONE 0
175 #define UB_DIR_READ 1
176 #define UB_DIR_ILLEGAL2 2
177 #define UB_DIR_WRITE 3
179 #define UB_DIR_CHAR(c) (((c)==UB_DIR_WRITE)? 'w': \
180 (((c)==UB_DIR_READ)? 'r': 'n'))
182 enum ub_scsi_cmd_state
{
183 UB_CMDST_INIT
, /* Initial state */
184 UB_CMDST_CMD
, /* Command submitted */
185 UB_CMDST_DATA
, /* Data phase */
186 UB_CMDST_CLR2STS
, /* Clearing before requesting status */
187 UB_CMDST_STAT
, /* Status phase */
188 UB_CMDST_CLEAR
, /* Clearing a stall (halt, actually) */
189 UB_CMDST_CLRRS
, /* Clearing before retrying status */
190 UB_CMDST_SENSE
, /* Sending Request Sense */
191 UB_CMDST_DONE
/* Final state */
195 unsigned char cdb
[UB_MAX_CDB_SIZE
];
196 unsigned char cdb_len
;
198 unsigned char dir
; /* 0 - none, 1 - read, 3 - write. */
199 enum ub_scsi_cmd_state state
;
201 struct ub_scsi_cmd
*next
;
203 int error
; /* Return code - valid upon done */
204 unsigned int act_len
; /* Return size */
205 unsigned char key
, asc
, ascq
; /* May be valid if error==-EIO */
207 int stat_count
; /* Retries getting status. */
208 unsigned int timeo
; /* jiffies until rq->timeout changes */
210 unsigned int len
; /* Requested length */
211 unsigned int current_sg
;
212 unsigned int nsg
; /* sgv[nsg] */
213 struct scatterlist sgv
[UB_MAX_REQ_SG
];
216 void (*done
)(struct ub_dev
*, struct ub_scsi_cmd
*);
222 unsigned int current_try
;
223 unsigned int nsg
; /* sgv[nsg] */
224 struct scatterlist sgv
[UB_MAX_REQ_SG
];
230 unsigned long nsec
; /* Linux size - 512 byte sectors */
231 unsigned int bsize
; /* Linux hardsect_size */
232 unsigned int bshift
; /* Shift between 512 and hard sects */
236 * This is a direct take-off from linux/include/completion.h
237 * The difference is that I do not wait on this thing, just poll.
238 * When I want to wait (ub_probe), I just use the stock completion.
240 * Note that INIT_COMPLETION takes no lock. It is correct. But why
241 * in the bloody hell that thing takes struct instead of pointer to struct
242 * is quite beyond me. I just copied it from the stock completion.
244 struct ub_completion
{
249 static inline void ub_init_completion(struct ub_completion
*x
)
252 spin_lock_init(&x
->lock
);
255 #define UB_INIT_COMPLETION(x) ((x).done = 0)
257 static void ub_complete(struct ub_completion
*x
)
261 spin_lock_irqsave(&x
->lock
, flags
);
263 spin_unlock_irqrestore(&x
->lock
, flags
);
266 static int ub_is_completed(struct ub_completion
*x
)
271 spin_lock_irqsave(&x
->lock
, flags
);
273 spin_unlock_irqrestore(&x
->lock
, flags
);
279 struct ub_scsi_cmd_queue
{
281 struct ub_scsi_cmd
*head
, *tail
;
285 * The block device instance (one per LUN).
289 struct list_head link
;
290 struct gendisk
*disk
;
291 int id
; /* Host index */
292 int num
; /* LUN number */
295 int changed
; /* Media was changed */
299 struct ub_request urq
;
301 /* Use Ingo's mempool if or when we have more than one command. */
303 * Currently we never need more than one command for the whole device.
304 * However, giving every LUN a command is a cheap and automatic way
305 * to enforce fairness between them.
308 struct ub_scsi_cmd cmdv
[1];
310 struct ub_capacity capacity
;
314 * The USB device instance.
318 atomic_t poison
; /* The USB device is disconnected */
319 int openc
; /* protected by ub_lock! */
320 /* kref is too implicit for our taste */
321 int reset
; /* Reset is running */
325 struct usb_device
*dev
;
326 struct usb_interface
*intf
;
328 struct list_head luns
;
330 unsigned int send_bulk_pipe
; /* cached pipe values */
331 unsigned int recv_bulk_pipe
;
332 unsigned int send_ctrl_pipe
;
333 unsigned int recv_ctrl_pipe
;
335 struct tasklet_struct tasklet
;
337 struct ub_scsi_cmd_queue cmd_queue
;
338 struct ub_scsi_cmd top_rqs_cmd
; /* REQUEST SENSE */
339 unsigned char top_sense
[UB_SENSE_SIZE
];
341 struct ub_completion work_done
;
343 struct timer_list work_timer
;
344 int last_pipe
; /* What might need clearing */
345 __le32 signature
; /* Learned signature */
346 struct bulk_cb_wrap work_bcb
;
347 struct bulk_cs_wrap work_bcs
;
348 struct usb_ctrlrequest work_cr
;
350 struct work_struct reset_work
;
351 wait_queue_head_t reset_wait
;
356 static void ub_cleanup(struct ub_dev
*sc
);
357 static int ub_request_fn_1(struct ub_lun
*lun
, struct request
*rq
);
358 static void ub_cmd_build_block(struct ub_dev
*sc
, struct ub_lun
*lun
,
359 struct ub_scsi_cmd
*cmd
, struct ub_request
*urq
);
360 static void ub_cmd_build_packet(struct ub_dev
*sc
, struct ub_lun
*lun
,
361 struct ub_scsi_cmd
*cmd
, struct ub_request
*urq
);
362 static void ub_rw_cmd_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
363 static void ub_end_rq(struct request
*rq
, unsigned int status
,
364 unsigned int cmd_len
);
365 static int ub_rw_cmd_retry(struct ub_dev
*sc
, struct ub_lun
*lun
,
366 struct ub_request
*urq
, struct ub_scsi_cmd
*cmd
);
367 static int ub_submit_scsi(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
368 static void ub_urb_complete(struct urb
*urb
);
369 static void ub_scsi_action(unsigned long _dev
);
370 static void ub_scsi_dispatch(struct ub_dev
*sc
);
371 static void ub_scsi_urb_compl(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
372 static void ub_data_start(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
373 static void ub_state_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
, int rc
);
374 static int __ub_state_stat(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
375 static void ub_state_stat(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
376 static void ub_state_stat_counted(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
377 static void ub_state_sense(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
);
378 static int ub_submit_clear_stall(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
,
380 static void ub_top_sense_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*scmd
);
381 static void ub_reset_enter(struct ub_dev
*sc
, int try);
382 static void ub_reset_task(struct work_struct
*work
);
383 static int ub_sync_tur(struct ub_dev
*sc
, struct ub_lun
*lun
);
384 static int ub_sync_read_cap(struct ub_dev
*sc
, struct ub_lun
*lun
,
385 struct ub_capacity
*ret
);
386 static int ub_sync_reset(struct ub_dev
*sc
);
387 static int ub_probe_clear_stall(struct ub_dev
*sc
, int stalled_pipe
);
388 static int ub_probe_lun(struct ub_dev
*sc
, int lnum
);
392 #ifdef CONFIG_USB_LIBUSUAL
394 #define ub_usb_ids usb_storage_usb_ids
397 static struct usb_device_id ub_usb_ids
[] = {
398 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE
, US_SC_SCSI
, US_PR_BULK
) },
402 MODULE_DEVICE_TABLE(usb
, ub_usb_ids
);
403 #endif /* CONFIG_USB_LIBUSUAL */
406 * Find me a way to identify "next free minor" for add_disk(),
407 * and the array disappears the next day. However, the number of
408 * hosts has something to do with the naming and /proc/partitions.
409 * This has to be thought out in detail before changing.
410 * If UB_MAX_HOST was 1000, we'd use a bitmap. Or a better data structure.
412 #define UB_MAX_HOSTS 26
413 static char ub_hostv
[UB_MAX_HOSTS
];
415 #define UB_QLOCK_NUM 5
416 static spinlock_t ub_qlockv
[UB_QLOCK_NUM
];
417 static int ub_qlock_next
= 0;
419 static DEFINE_SPINLOCK(ub_lock
); /* Locks globals and ->openc */
424 * This also stores the host for indexing by minor, which is somewhat dirty.
426 static int ub_id_get(void)
431 spin_lock_irqsave(&ub_lock
, flags
);
432 for (i
= 0; i
< UB_MAX_HOSTS
; i
++) {
433 if (ub_hostv
[i
] == 0) {
435 spin_unlock_irqrestore(&ub_lock
, flags
);
439 spin_unlock_irqrestore(&ub_lock
, flags
);
443 static void ub_id_put(int id
)
447 if (id
< 0 || id
>= UB_MAX_HOSTS
) {
448 printk(KERN_ERR DRV_NAME
": bad host ID %d\n", id
);
452 spin_lock_irqsave(&ub_lock
, flags
);
453 if (ub_hostv
[id
] == 0) {
454 spin_unlock_irqrestore(&ub_lock
, flags
);
455 printk(KERN_ERR DRV_NAME
": freeing free host ID %d\n", id
);
459 spin_unlock_irqrestore(&ub_lock
, flags
);
463 * This is necessitated by the fact that blk_cleanup_queue does not
464 * necesserily destroy the queue. Instead, it may merely decrease q->refcnt.
465 * Since our blk_init_queue() passes a spinlock common with ub_dev,
466 * we have life time issues when ub_cleanup frees ub_dev.
468 static spinlock_t
*ub_next_lock(void)
473 spin_lock_irqsave(&ub_lock
, flags
);
474 ret
= &ub_qlockv
[ub_qlock_next
];
475 ub_qlock_next
= (ub_qlock_next
+ 1) % UB_QLOCK_NUM
;
476 spin_unlock_irqrestore(&ub_lock
, flags
);
481 * Downcount for deallocation. This rides on two assumptions:
482 * - once something is poisoned, its refcount cannot grow
483 * - opens cannot happen at this time (del_gendisk was done)
484 * If the above is true, we can drop the lock, which we need for
485 * blk_cleanup_queue(): the silly thing may attempt to sleep.
486 * [Actually, it never needs to sleep for us, but it calls might_sleep()]
488 static void ub_put(struct ub_dev
*sc
)
492 spin_lock_irqsave(&ub_lock
, flags
);
494 if (sc
->openc
== 0 && atomic_read(&sc
->poison
)) {
495 spin_unlock_irqrestore(&ub_lock
, flags
);
498 spin_unlock_irqrestore(&ub_lock
, flags
);
503 * Final cleanup and deallocation.
505 static void ub_cleanup(struct ub_dev
*sc
)
509 struct request_queue
*q
;
511 while (!list_empty(&sc
->luns
)) {
513 lun
= list_entry(p
, struct ub_lun
, link
);
516 /* I don't think queue can be NULL. But... Stolen from sx8.c */
517 if ((q
= lun
->disk
->queue
) != NULL
)
518 blk_cleanup_queue(q
);
520 * If we zero disk->private_data BEFORE put_disk, we have
521 * to check for NULL all over the place in open, release,
522 * check_media and revalidate, because the block level
523 * semaphore is well inside the put_disk.
524 * But we cannot zero after the call, because *disk is gone.
525 * The sd.c is blatantly racy in this area.
527 /* disk->private_data = NULL; */
535 usb_set_intfdata(sc
->intf
, NULL
);
536 usb_put_intf(sc
->intf
);
537 usb_put_dev(sc
->dev
);
542 * The "command allocator".
544 static struct ub_scsi_cmd
*ub_get_cmd(struct ub_lun
*lun
)
546 struct ub_scsi_cmd
*ret
;
555 static void ub_put_cmd(struct ub_lun
*lun
, struct ub_scsi_cmd
*cmd
)
557 if (cmd
!= &lun
->cmdv
[0]) {
558 printk(KERN_WARNING
"%s: releasing a foreign cmd %p\n",
563 printk(KERN_WARNING
"%s: releasing a free cmd\n", lun
->name
);
572 static void ub_cmdq_add(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
574 struct ub_scsi_cmd_queue
*t
= &sc
->cmd_queue
;
576 if (t
->qlen
++ == 0) {
584 if (t
->qlen
> t
->qmax
)
588 static void ub_cmdq_insert(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
590 struct ub_scsi_cmd_queue
*t
= &sc
->cmd_queue
;
592 if (t
->qlen
++ == 0) {
600 if (t
->qlen
> t
->qmax
)
604 static struct ub_scsi_cmd
*ub_cmdq_pop(struct ub_dev
*sc
)
606 struct ub_scsi_cmd_queue
*t
= &sc
->cmd_queue
;
607 struct ub_scsi_cmd
*cmd
;
619 #define ub_cmdq_peek(sc) ((sc)->cmd_queue.head)
622 * The request function is our main entry point
625 static void ub_request_fn(struct request_queue
*q
)
627 struct ub_lun
*lun
= q
->queuedata
;
630 while ((rq
= elv_next_request(q
)) != NULL
) {
631 if (ub_request_fn_1(lun
, rq
) != 0) {
638 static int ub_request_fn_1(struct ub_lun
*lun
, struct request
*rq
)
640 struct ub_dev
*sc
= lun
->udev
;
641 struct ub_scsi_cmd
*cmd
;
642 struct ub_request
*urq
;
645 if (atomic_read(&sc
->poison
)) {
646 blkdev_dequeue_request(rq
);
647 ub_end_rq(rq
, DID_NO_CONNECT
<< 16, blk_rq_bytes(rq
));
651 if (lun
->changed
&& !blk_pc_request(rq
)) {
652 blkdev_dequeue_request(rq
);
653 ub_end_rq(rq
, SAM_STAT_CHECK_CONDITION
, blk_rq_bytes(rq
));
657 if (lun
->urq
.rq
!= NULL
)
659 if ((cmd
= ub_get_cmd(lun
)) == NULL
)
661 memset(cmd
, 0, sizeof(struct ub_scsi_cmd
));
663 blkdev_dequeue_request(rq
);
666 memset(urq
, 0, sizeof(struct ub_request
));
670 * get scatterlist from block layer
672 sg_init_table(&urq
->sgv
[0], UB_MAX_REQ_SG
);
673 n_elem
= blk_rq_map_sg(lun
->disk
->queue
, rq
, &urq
->sgv
[0]);
675 /* Impossible, because blk_rq_map_sg should not hit ENOMEM. */
676 printk(KERN_INFO
"%s: failed request map (%d)\n",
680 if (n_elem
> UB_MAX_REQ_SG
) { /* Paranoia */
681 printk(KERN_WARNING
"%s: request with %d segments\n",
687 if (blk_pc_request(rq
)) {
688 ub_cmd_build_packet(sc
, lun
, cmd
, urq
);
690 ub_cmd_build_block(sc
, lun
, cmd
, urq
);
692 cmd
->state
= UB_CMDST_INIT
;
694 cmd
->done
= ub_rw_cmd_done
;
697 cmd
->tag
= sc
->tagcnt
++;
698 if (ub_submit_scsi(sc
, cmd
) != 0)
704 ub_put_cmd(lun
, cmd
);
705 ub_end_rq(rq
, DID_ERROR
<< 16, blk_rq_bytes(rq
));
709 static void ub_cmd_build_block(struct ub_dev
*sc
, struct ub_lun
*lun
,
710 struct ub_scsi_cmd
*cmd
, struct ub_request
*urq
)
712 struct request
*rq
= urq
->rq
;
713 unsigned int block
, nblks
;
715 if (rq_data_dir(rq
) == WRITE
)
716 cmd
->dir
= UB_DIR_WRITE
;
718 cmd
->dir
= UB_DIR_READ
;
721 memcpy(cmd
->sgv
, urq
->sgv
, sizeof(struct scatterlist
) * cmd
->nsg
);
726 * The call to blk_queue_hardsect_size() guarantees that request
727 * is aligned, but it is given in terms of 512 byte units, always.
729 block
= blk_rq_pos(rq
) >> lun
->capacity
.bshift
;
730 nblks
= blk_rq_sectors(rq
) >> lun
->capacity
.bshift
;
732 cmd
->cdb
[0] = (cmd
->dir
== UB_DIR_READ
)? READ_10
: WRITE_10
;
733 /* 10-byte uses 4 bytes of LBA: 2147483648KB, 2097152MB, 2048GB */
734 cmd
->cdb
[2] = block
>> 24;
735 cmd
->cdb
[3] = block
>> 16;
736 cmd
->cdb
[4] = block
>> 8;
738 cmd
->cdb
[7] = nblks
>> 8;
742 cmd
->len
= blk_rq_bytes(rq
);
745 static void ub_cmd_build_packet(struct ub_dev
*sc
, struct ub_lun
*lun
,
746 struct ub_scsi_cmd
*cmd
, struct ub_request
*urq
)
748 struct request
*rq
= urq
->rq
;
750 if (blk_rq_bytes(rq
) == 0) {
751 cmd
->dir
= UB_DIR_NONE
;
753 if (rq_data_dir(rq
) == WRITE
)
754 cmd
->dir
= UB_DIR_WRITE
;
756 cmd
->dir
= UB_DIR_READ
;
760 memcpy(cmd
->sgv
, urq
->sgv
, sizeof(struct scatterlist
) * cmd
->nsg
);
762 memcpy(&cmd
->cdb
, rq
->cmd
, rq
->cmd_len
);
763 cmd
->cdb_len
= rq
->cmd_len
;
765 cmd
->len
= blk_rq_bytes(rq
);
768 * To reapply this to every URB is not as incorrect as it looks.
769 * In return, we avoid any complicated tracking calculations.
771 cmd
->timeo
= rq
->timeout
;
774 static void ub_rw_cmd_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
776 struct ub_lun
*lun
= cmd
->lun
;
777 struct ub_request
*urq
= cmd
->back
;
779 unsigned int scsi_status
;
780 unsigned int cmd_len
;
784 if (cmd
->error
== 0) {
785 if (blk_pc_request(rq
)) {
786 if (cmd
->act_len
< blk_rq_bytes(rq
))
787 rq
->resid_len
= blk_rq_bytes(rq
) - cmd
->act_len
;
790 if (cmd
->act_len
!= cmd
->len
) {
791 scsi_status
= SAM_STAT_CHECK_CONDITION
;
797 if (blk_pc_request(rq
)) {
798 /* UB_SENSE_SIZE is smaller than SCSI_SENSE_BUFFERSIZE */
799 memcpy(rq
->sense
, sc
->top_sense
, UB_SENSE_SIZE
);
800 rq
->sense_len
= UB_SENSE_SIZE
;
801 if (sc
->top_sense
[0] != 0)
802 scsi_status
= SAM_STAT_CHECK_CONDITION
;
804 scsi_status
= DID_ERROR
<< 16;
806 if (cmd
->error
== -EIO
&&
808 cmd
->key
== MEDIUM_ERROR
||
809 cmd
->key
== UNIT_ATTENTION
)) {
810 if (ub_rw_cmd_retry(sc
, lun
, urq
, cmd
) == 0)
813 scsi_status
= SAM_STAT_CHECK_CONDITION
;
820 ub_put_cmd(lun
, cmd
);
821 ub_end_rq(rq
, scsi_status
, cmd_len
);
822 blk_start_queue(lun
->disk
->queue
);
825 static void ub_end_rq(struct request
*rq
, unsigned int scsi_status
,
826 unsigned int cmd_len
)
831 if (scsi_status
== 0) {
835 rq
->errors
= scsi_status
;
837 rqlen
= blk_rq_bytes(rq
); /* Oddly enough, this is the residue. */
838 if (__blk_end_request(rq
, error
, cmd_len
)) {
839 printk(KERN_WARNING DRV_NAME
840 ": __blk_end_request blew, %s-cmd total %u rqlen %ld\n",
841 blk_pc_request(rq
)? "pc": "fs", cmd_len
, rqlen
);
845 static int ub_rw_cmd_retry(struct ub_dev
*sc
, struct ub_lun
*lun
,
846 struct ub_request
*urq
, struct ub_scsi_cmd
*cmd
)
849 if (atomic_read(&sc
->poison
))
852 ub_reset_enter(sc
, urq
->current_try
);
854 if (urq
->current_try
>= 3)
858 /* Remove this if anyone complains of flooding. */
859 printk(KERN_DEBUG
"%s: dir %c len/act %d/%d "
860 "[sense %x %02x %02x] retry %d\n",
861 sc
->name
, UB_DIR_CHAR(cmd
->dir
), cmd
->len
, cmd
->act_len
,
862 cmd
->key
, cmd
->asc
, cmd
->ascq
, urq
->current_try
);
864 memset(cmd
, 0, sizeof(struct ub_scsi_cmd
));
865 ub_cmd_build_block(sc
, lun
, cmd
, urq
);
867 cmd
->state
= UB_CMDST_INIT
;
869 cmd
->done
= ub_rw_cmd_done
;
872 cmd
->tag
= sc
->tagcnt
++;
875 return ub_submit_scsi(sc
, cmd
);
877 ub_cmdq_add(sc
, cmd
);
883 * Submit a regular SCSI operation (not an auto-sense).
885 * The Iron Law of Good Submit Routine is:
886 * Zero return - callback is done, Nonzero return - callback is not done.
889 * Host is assumed locked.
891 static int ub_submit_scsi(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
894 if (cmd
->state
!= UB_CMDST_INIT
||
895 (cmd
->dir
!= UB_DIR_NONE
&& cmd
->len
== 0)) {
899 ub_cmdq_add(sc
, cmd
);
901 * We can call ub_scsi_dispatch(sc) right away here, but it's a little
902 * safer to jump to a tasklet, in case upper layers do something silly.
904 tasklet_schedule(&sc
->tasklet
);
909 * Submit the first URB for the queued command.
910 * This function does not deal with queueing in any way.
912 static int ub_scsi_cmd_start(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
914 struct bulk_cb_wrap
*bcb
;
920 * ``If the allocation length is eighteen or greater, and a device
921 * server returns less than eithteen bytes of data, the application
922 * client should assume that the bytes not transferred would have been
923 * zeroes had the device server returned those bytes.''
925 * We zero sense for all commands so that when a packet request
926 * fails it does not return a stale sense.
928 memset(&sc
->top_sense
, 0, UB_SENSE_SIZE
);
930 /* set up the command wrapper */
931 bcb
->Signature
= cpu_to_le32(US_BULK_CB_SIGN
);
932 bcb
->Tag
= cmd
->tag
; /* Endianness is not important */
933 bcb
->DataTransferLength
= cpu_to_le32(cmd
->len
);
934 bcb
->Flags
= (cmd
->dir
== UB_DIR_READ
) ? 0x80 : 0;
935 bcb
->Lun
= (cmd
->lun
!= NULL
) ? cmd
->lun
->num
: 0;
936 bcb
->Length
= cmd
->cdb_len
;
938 /* copy the command payload */
939 memcpy(bcb
->CDB
, cmd
->cdb
, UB_MAX_CDB_SIZE
);
941 UB_INIT_COMPLETION(sc
->work_done
);
943 sc
->last_pipe
= sc
->send_bulk_pipe
;
944 usb_fill_bulk_urb(&sc
->work_urb
, sc
->dev
, sc
->send_bulk_pipe
,
945 bcb
, US_BULK_CB_WRAP_LEN
, ub_urb_complete
, sc
);
947 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_ATOMIC
)) != 0) {
948 /* XXX Clear stalls */
949 ub_complete(&sc
->work_done
);
953 sc
->work_timer
.expires
= jiffies
+ UB_URB_TIMEOUT
;
954 add_timer(&sc
->work_timer
);
956 cmd
->state
= UB_CMDST_CMD
;
963 static void ub_urb_timeout(unsigned long arg
)
965 struct ub_dev
*sc
= (struct ub_dev
*) arg
;
968 spin_lock_irqsave(sc
->lock
, flags
);
969 if (!ub_is_completed(&sc
->work_done
))
970 usb_unlink_urb(&sc
->work_urb
);
971 spin_unlock_irqrestore(sc
->lock
, flags
);
975 * Completion routine for the work URB.
977 * This can be called directly from usb_submit_urb (while we have
978 * the sc->lock taken) and from an interrupt (while we do NOT have
979 * the sc->lock taken). Therefore, bounce this off to a tasklet.
981 static void ub_urb_complete(struct urb
*urb
)
983 struct ub_dev
*sc
= urb
->context
;
985 ub_complete(&sc
->work_done
);
986 tasklet_schedule(&sc
->tasklet
);
989 static void ub_scsi_action(unsigned long _dev
)
991 struct ub_dev
*sc
= (struct ub_dev
*) _dev
;
994 spin_lock_irqsave(sc
->lock
, flags
);
995 ub_scsi_dispatch(sc
);
996 spin_unlock_irqrestore(sc
->lock
, flags
);
999 static void ub_scsi_dispatch(struct ub_dev
*sc
)
1001 struct ub_scsi_cmd
*cmd
;
1004 while (!sc
->reset
&& (cmd
= ub_cmdq_peek(sc
)) != NULL
) {
1005 if (cmd
->state
== UB_CMDST_DONE
) {
1007 (*cmd
->done
)(sc
, cmd
);
1008 } else if (cmd
->state
== UB_CMDST_INIT
) {
1009 if ((rc
= ub_scsi_cmd_start(sc
, cmd
)) == 0)
1012 cmd
->state
= UB_CMDST_DONE
;
1014 if (!ub_is_completed(&sc
->work_done
))
1016 del_timer(&sc
->work_timer
);
1017 ub_scsi_urb_compl(sc
, cmd
);
1022 static void ub_scsi_urb_compl(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1024 struct urb
*urb
= &sc
->work_urb
;
1025 struct bulk_cs_wrap
*bcs
;
1030 if (atomic_read(&sc
->poison
)) {
1031 ub_state_done(sc
, cmd
, -ENODEV
);
1035 endp
= usb_pipeendpoint(sc
->last_pipe
);
1036 if (usb_pipein(sc
->last_pipe
))
1039 if (cmd
->state
== UB_CMDST_CLEAR
) {
1040 if (urb
->status
== -EPIPE
) {
1042 * STALL while clearning STALL.
1043 * The control pipe clears itself - nothing to do.
1045 printk(KERN_NOTICE
"%s: stall on control pipe\n",
1051 * We ignore the result for the halt clear.
1054 usb_reset_endpoint(sc
->dev
, endp
);
1056 ub_state_sense(sc
, cmd
);
1058 } else if (cmd
->state
== UB_CMDST_CLR2STS
) {
1059 if (urb
->status
== -EPIPE
) {
1060 printk(KERN_NOTICE
"%s: stall on control pipe\n",
1066 * We ignore the result for the halt clear.
1069 usb_reset_endpoint(sc
->dev
, endp
);
1071 ub_state_stat(sc
, cmd
);
1073 } else if (cmd
->state
== UB_CMDST_CLRRS
) {
1074 if (urb
->status
== -EPIPE
) {
1075 printk(KERN_NOTICE
"%s: stall on control pipe\n",
1081 * We ignore the result for the halt clear.
1084 usb_reset_endpoint(sc
->dev
, endp
);
1086 ub_state_stat_counted(sc
, cmd
);
1088 } else if (cmd
->state
== UB_CMDST_CMD
) {
1089 switch (urb
->status
) {
1095 rc
= ub_submit_clear_stall(sc
, cmd
, sc
->last_pipe
);
1097 printk(KERN_NOTICE
"%s: "
1098 "unable to submit clear (%d)\n",
1101 * This is typically ENOMEM or some other such shit.
1102 * Retrying is pointless. Just do Bad End on it...
1104 ub_state_done(sc
, cmd
, rc
);
1107 cmd
->state
= UB_CMDST_CLEAR
;
1109 case -ESHUTDOWN
: /* unplug */
1110 case -EILSEQ
: /* unplug timeout on uhci */
1111 ub_state_done(sc
, cmd
, -ENODEV
);
1116 if (urb
->actual_length
!= US_BULK_CB_WRAP_LEN
) {
1120 if (cmd
->dir
== UB_DIR_NONE
|| cmd
->nsg
< 1) {
1121 ub_state_stat(sc
, cmd
);
1125 // udelay(125); // usb-storage has this
1126 ub_data_start(sc
, cmd
);
1128 } else if (cmd
->state
== UB_CMDST_DATA
) {
1129 if (urb
->status
== -EPIPE
) {
1130 rc
= ub_submit_clear_stall(sc
, cmd
, sc
->last_pipe
);
1132 printk(KERN_NOTICE
"%s: "
1133 "unable to submit clear (%d)\n",
1135 ub_state_done(sc
, cmd
, rc
);
1138 cmd
->state
= UB_CMDST_CLR2STS
;
1141 if (urb
->status
== -EOVERFLOW
) {
1143 * A babble? Failure, but we must transfer CSW now.
1145 cmd
->error
= -EOVERFLOW
; /* A cheap trick... */
1146 ub_state_stat(sc
, cmd
);
1150 if (cmd
->dir
== UB_DIR_WRITE
) {
1152 * Do not continue writes in case of a failure.
1153 * Doing so would cause sectors to be mixed up,
1154 * which is worse than sectors lost.
1156 * We must try to read the CSW, or many devices
1159 len
= urb
->actual_length
;
1160 if (urb
->status
!= 0 ||
1161 len
!= cmd
->sgv
[cmd
->current_sg
].length
) {
1162 cmd
->act_len
+= len
;
1165 ub_state_stat(sc
, cmd
);
1171 * If an error occurs on read, we record it, and
1172 * continue to fetch data in order to avoid bubble.
1174 * As a small shortcut, we stop if we detect that
1175 * a CSW mixed into data.
1177 if (urb
->status
!= 0)
1180 len
= urb
->actual_length
;
1181 if (urb
->status
!= 0 ||
1182 len
!= cmd
->sgv
[cmd
->current_sg
].length
) {
1183 if ((len
& 0x1FF) == US_BULK_CS_WRAP_LEN
)
1188 cmd
->act_len
+= urb
->actual_length
;
1190 if (++cmd
->current_sg
< cmd
->nsg
) {
1191 ub_data_start(sc
, cmd
);
1194 ub_state_stat(sc
, cmd
);
1196 } else if (cmd
->state
== UB_CMDST_STAT
) {
1197 if (urb
->status
== -EPIPE
) {
1198 rc
= ub_submit_clear_stall(sc
, cmd
, sc
->last_pipe
);
1200 printk(KERN_NOTICE
"%s: "
1201 "unable to submit clear (%d)\n",
1203 ub_state_done(sc
, cmd
, rc
);
1208 * Having a stall when getting CSW is an error, so
1209 * make sure uppper levels are not oblivious to it.
1211 cmd
->error
= -EIO
; /* A cheap trick... */
1213 cmd
->state
= UB_CMDST_CLRRS
;
1217 /* Catch everything, including -EOVERFLOW and other nasties. */
1218 if (urb
->status
!= 0)
1221 if (urb
->actual_length
== 0) {
1222 ub_state_stat_counted(sc
, cmd
);
1227 * Check the returned Bulk protocol status.
1228 * The status block has to be validated first.
1231 bcs
= &sc
->work_bcs
;
1233 if (sc
->signature
== cpu_to_le32(0)) {
1235 * This is the first reply, so do not perform the check.
1236 * Instead, remember the signature the device uses
1237 * for future checks. But do not allow a nul.
1239 sc
->signature
= bcs
->Signature
;
1240 if (sc
->signature
== cpu_to_le32(0)) {
1241 ub_state_stat_counted(sc
, cmd
);
1245 if (bcs
->Signature
!= sc
->signature
) {
1246 ub_state_stat_counted(sc
, cmd
);
1251 if (bcs
->Tag
!= cmd
->tag
) {
1253 * This usually happens when we disagree with the
1254 * device's microcode about something. For instance,
1255 * a few of them throw this after timeouts. They buffer
1256 * commands and reply at commands we timed out before.
1257 * Without flushing these replies we loop forever.
1259 ub_state_stat_counted(sc
, cmd
);
1263 if (!sc
->bad_resid
) {
1264 len
= le32_to_cpu(bcs
->Residue
);
1265 if (len
!= cmd
->len
- cmd
->act_len
) {
1267 * Only start ignoring if this cmd ended well.
1269 if (cmd
->len
== cmd
->act_len
) {
1270 printk(KERN_NOTICE
"%s: "
1271 "bad residual %d of %d, ignoring\n",
1272 sc
->name
, len
, cmd
->len
);
1278 switch (bcs
->Status
) {
1279 case US_BULK_STAT_OK
:
1281 case US_BULK_STAT_FAIL
:
1282 ub_state_sense(sc
, cmd
);
1284 case US_BULK_STAT_PHASE
:
1287 printk(KERN_INFO
"%s: unknown CSW status 0x%x\n",
1288 sc
->name
, bcs
->Status
);
1289 ub_state_done(sc
, cmd
, -EINVAL
);
1293 /* Not zeroing error to preserve a babble indicator */
1294 if (cmd
->error
!= 0) {
1295 ub_state_sense(sc
, cmd
);
1298 cmd
->state
= UB_CMDST_DONE
;
1300 (*cmd
->done
)(sc
, cmd
);
1302 } else if (cmd
->state
== UB_CMDST_SENSE
) {
1303 ub_state_done(sc
, cmd
, -EIO
);
1306 printk(KERN_WARNING
"%s: wrong command state %d\n",
1307 sc
->name
, cmd
->state
);
1308 ub_state_done(sc
, cmd
, -EINVAL
);
1313 Bad_End
: /* Little Excel is dead */
1314 ub_state_done(sc
, cmd
, -EIO
);
1318 * Factorization helper for the command state machine:
1319 * Initiate a data segment transfer.
1321 static void ub_data_start(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1323 struct scatterlist
*sg
= &cmd
->sgv
[cmd
->current_sg
];
1327 UB_INIT_COMPLETION(sc
->work_done
);
1329 if (cmd
->dir
== UB_DIR_READ
)
1330 pipe
= sc
->recv_bulk_pipe
;
1332 pipe
= sc
->send_bulk_pipe
;
1333 sc
->last_pipe
= pipe
;
1334 usb_fill_bulk_urb(&sc
->work_urb
, sc
->dev
, pipe
, sg_virt(sg
),
1335 sg
->length
, ub_urb_complete
, sc
);
1337 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_ATOMIC
)) != 0) {
1338 /* XXX Clear stalls */
1339 ub_complete(&sc
->work_done
);
1340 ub_state_done(sc
, cmd
, rc
);
1345 sc
->work_timer
.expires
= jiffies
+ cmd
->timeo
;
1347 sc
->work_timer
.expires
= jiffies
+ UB_DATA_TIMEOUT
;
1348 add_timer(&sc
->work_timer
);
1350 cmd
->state
= UB_CMDST_DATA
;
1354 * Factorization helper for the command state machine:
1355 * Finish the command.
1357 static void ub_state_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
, int rc
)
1361 cmd
->state
= UB_CMDST_DONE
;
1363 (*cmd
->done
)(sc
, cmd
);
1367 * Factorization helper for the command state machine:
1368 * Submit a CSW read.
1370 static int __ub_state_stat(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1374 UB_INIT_COMPLETION(sc
->work_done
);
1376 sc
->last_pipe
= sc
->recv_bulk_pipe
;
1377 usb_fill_bulk_urb(&sc
->work_urb
, sc
->dev
, sc
->recv_bulk_pipe
,
1378 &sc
->work_bcs
, US_BULK_CS_WRAP_LEN
, ub_urb_complete
, sc
);
1380 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_ATOMIC
)) != 0) {
1381 /* XXX Clear stalls */
1382 ub_complete(&sc
->work_done
);
1383 ub_state_done(sc
, cmd
, rc
);
1388 sc
->work_timer
.expires
= jiffies
+ cmd
->timeo
;
1390 sc
->work_timer
.expires
= jiffies
+ UB_STAT_TIMEOUT
;
1391 add_timer(&sc
->work_timer
);
1396 * Factorization helper for the command state machine:
1397 * Submit a CSW read and go to STAT state.
1399 static void ub_state_stat(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1402 if (__ub_state_stat(sc
, cmd
) != 0)
1405 cmd
->stat_count
= 0;
1406 cmd
->state
= UB_CMDST_STAT
;
1410 * Factorization helper for the command state machine:
1411 * Submit a CSW read and go to STAT state with counter (along [C] path).
1413 static void ub_state_stat_counted(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1416 if (++cmd
->stat_count
>= 4) {
1417 ub_state_sense(sc
, cmd
);
1421 if (__ub_state_stat(sc
, cmd
) != 0)
1424 cmd
->state
= UB_CMDST_STAT
;
1428 * Factorization helper for the command state machine:
1429 * Submit a REQUEST SENSE and go to SENSE state.
1431 static void ub_state_sense(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1433 struct ub_scsi_cmd
*scmd
;
1434 struct scatterlist
*sg
;
1437 if (cmd
->cdb
[0] == REQUEST_SENSE
) {
1442 scmd
= &sc
->top_rqs_cmd
;
1443 memset(scmd
, 0, sizeof(struct ub_scsi_cmd
));
1444 scmd
->cdb
[0] = REQUEST_SENSE
;
1445 scmd
->cdb
[4] = UB_SENSE_SIZE
;
1447 scmd
->dir
= UB_DIR_READ
;
1448 scmd
->state
= UB_CMDST_INIT
;
1451 sg_init_table(sg
, UB_MAX_REQ_SG
);
1452 sg_set_page(sg
, virt_to_page(sc
->top_sense
), UB_SENSE_SIZE
,
1453 (unsigned long)sc
->top_sense
& (PAGE_SIZE
-1));
1454 scmd
->len
= UB_SENSE_SIZE
;
1455 scmd
->lun
= cmd
->lun
;
1456 scmd
->done
= ub_top_sense_done
;
1459 scmd
->tag
= sc
->tagcnt
++;
1461 cmd
->state
= UB_CMDST_SENSE
;
1463 ub_cmdq_insert(sc
, scmd
);
1467 ub_state_done(sc
, cmd
, rc
);
1471 * A helper for the command's state machine:
1472 * Submit a stall clear.
1474 static int ub_submit_clear_stall(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
,
1478 struct usb_ctrlrequest
*cr
;
1481 endp
= usb_pipeendpoint(stalled_pipe
);
1482 if (usb_pipein (stalled_pipe
))
1486 cr
->bRequestType
= USB_RECIP_ENDPOINT
;
1487 cr
->bRequest
= USB_REQ_CLEAR_FEATURE
;
1488 cr
->wValue
= cpu_to_le16(USB_ENDPOINT_HALT
);
1489 cr
->wIndex
= cpu_to_le16(endp
);
1490 cr
->wLength
= cpu_to_le16(0);
1492 UB_INIT_COMPLETION(sc
->work_done
);
1494 usb_fill_control_urb(&sc
->work_urb
, sc
->dev
, sc
->send_ctrl_pipe
,
1495 (unsigned char*) cr
, NULL
, 0, ub_urb_complete
, sc
);
1497 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_ATOMIC
)) != 0) {
1498 ub_complete(&sc
->work_done
);
1502 sc
->work_timer
.expires
= jiffies
+ UB_CTRL_TIMEOUT
;
1503 add_timer(&sc
->work_timer
);
1509 static void ub_top_sense_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*scmd
)
1511 unsigned char *sense
= sc
->top_sense
;
1512 struct ub_scsi_cmd
*cmd
;
1515 * Find the command which triggered the unit attention or a check,
1516 * save the sense into it, and advance its state machine.
1518 if ((cmd
= ub_cmdq_peek(sc
)) == NULL
) {
1519 printk(KERN_WARNING
"%s: sense done while idle\n", sc
->name
);
1522 if (cmd
!= scmd
->back
) {
1523 printk(KERN_WARNING
"%s: "
1524 "sense done for wrong command 0x%x\n",
1525 sc
->name
, cmd
->tag
);
1528 if (cmd
->state
!= UB_CMDST_SENSE
) {
1529 printk(KERN_WARNING
"%s: sense done with bad cmd state %d\n",
1530 sc
->name
, cmd
->state
);
1535 * Ignoring scmd->act_len, because the buffer was pre-zeroed.
1537 cmd
->key
= sense
[2] & 0x0F;
1538 cmd
->asc
= sense
[12];
1539 cmd
->ascq
= sense
[13];
1541 ub_scsi_urb_compl(sc
, cmd
);
1548 static void ub_reset_enter(struct ub_dev
*sc
, int try)
1552 /* This happens often on multi-LUN devices. */
1555 sc
->reset
= try + 1;
1557 #if 0 /* Not needed because the disconnect waits for us. */
1558 unsigned long flags
;
1559 spin_lock_irqsave(&ub_lock
, flags
);
1561 spin_unlock_irqrestore(&ub_lock
, flags
);
1564 #if 0 /* We let them stop themselves. */
1566 list_for_each_entry(lun
, &sc
->luns
, link
) {
1567 blk_stop_queue(lun
->disk
->queue
);
1571 schedule_work(&sc
->reset_work
);
1574 static void ub_reset_task(struct work_struct
*work
)
1576 struct ub_dev
*sc
= container_of(work
, struct ub_dev
, reset_work
);
1577 unsigned long flags
;
1582 printk(KERN_WARNING
"%s: Running reset unrequested\n",
1587 if (atomic_read(&sc
->poison
)) {
1589 } else if ((sc
->reset
& 1) == 0) {
1591 msleep(700); /* usb-storage sleeps 6s (!) */
1592 ub_probe_clear_stall(sc
, sc
->recv_bulk_pipe
);
1593 ub_probe_clear_stall(sc
, sc
->send_bulk_pipe
);
1594 } else if (sc
->dev
->actconfig
->desc
.bNumInterfaces
!= 1) {
1597 rc
= usb_lock_device_for_reset(sc
->dev
, sc
->intf
);
1600 "%s: usb_lock_device_for_reset failed (%d)\n",
1603 rc
= usb_reset_device(sc
->dev
);
1605 printk(KERN_NOTICE
"%s: "
1606 "usb_lock_device_for_reset failed (%d)\n",
1609 usb_unlock_device(sc
->dev
);
1614 * In theory, no commands can be running while reset is active,
1615 * so nobody can ask for another reset, and so we do not need any
1616 * queues of resets or anything. We do need a spinlock though,
1617 * to interact with block layer.
1619 spin_lock_irqsave(sc
->lock
, flags
);
1621 tasklet_schedule(&sc
->tasklet
);
1622 list_for_each_entry(lun
, &sc
->luns
, link
) {
1623 blk_start_queue(lun
->disk
->queue
);
1625 wake_up(&sc
->reset_wait
);
1626 spin_unlock_irqrestore(sc
->lock
, flags
);
1630 * XXX Reset brackets are too much hassle to implement, so just stub them
1631 * in order to prevent forced unbinding (which deadlocks solid when our
1632 * ->disconnect method waits for the reset to complete and this kills keventd).
1634 * XXX Tell Alan to move usb_unlock_device inside of usb_reset_device,
1635 * or else the post_reset is invoked, and restats I/O on a locked device.
1637 static int ub_pre_reset(struct usb_interface
*iface
) {
1641 static int ub_post_reset(struct usb_interface
*iface
) {
1646 * This is called from a process context.
1648 static void ub_revalidate(struct ub_dev
*sc
, struct ub_lun
*lun
)
1651 lun
->readonly
= 0; /* XXX Query this from the device */
1653 lun
->capacity
.nsec
= 0;
1654 lun
->capacity
.bsize
= 512;
1655 lun
->capacity
.bshift
= 0;
1657 if (ub_sync_tur(sc
, lun
) != 0)
1658 return; /* Not ready */
1661 if (ub_sync_read_cap(sc
, lun
, &lun
->capacity
) != 0) {
1663 * The retry here means something is wrong, either with the
1664 * device, with the transport, or with our code.
1665 * We keep this because sd.c has retries for capacity.
1667 if (ub_sync_read_cap(sc
, lun
, &lun
->capacity
) != 0) {
1668 lun
->capacity
.nsec
= 0;
1669 lun
->capacity
.bsize
= 512;
1670 lun
->capacity
.bshift
= 0;
1677 * This is mostly needed to keep refcounting, but also to support
1678 * media checks on removable media drives.
1680 static int ub_bd_open(struct block_device
*bdev
, fmode_t mode
)
1682 struct ub_lun
*lun
= bdev
->bd_disk
->private_data
;
1683 struct ub_dev
*sc
= lun
->udev
;
1684 unsigned long flags
;
1687 spin_lock_irqsave(&ub_lock
, flags
);
1688 if (atomic_read(&sc
->poison
)) {
1689 spin_unlock_irqrestore(&ub_lock
, flags
);
1693 spin_unlock_irqrestore(&ub_lock
, flags
);
1695 if (lun
->removable
|| lun
->readonly
)
1696 check_disk_change(bdev
);
1699 * The sd.c considers ->media_present and ->changed not equivalent,
1700 * under some pretty murky conditions (a failure of READ CAPACITY).
1701 * We may need it one day.
1703 if (lun
->removable
&& lun
->changed
&& !(mode
& FMODE_NDELAY
)) {
1708 if (lun
->readonly
&& (mode
& FMODE_WRITE
)) {
1722 static int ub_bd_release(struct gendisk
*disk
, fmode_t mode
)
1724 struct ub_lun
*lun
= disk
->private_data
;
1725 struct ub_dev
*sc
= lun
->udev
;
1732 * The ioctl interface.
1734 static int ub_bd_ioctl(struct block_device
*bdev
, fmode_t mode
,
1735 unsigned int cmd
, unsigned long arg
)
1737 struct gendisk
*disk
= bdev
->bd_disk
;
1738 void __user
*usermem
= (void __user
*) arg
;
1740 return scsi_cmd_ioctl(disk
->queue
, disk
, mode
, cmd
, usermem
);
1744 * This is called by check_disk_change if we reported a media change.
1745 * The main onjective here is to discover the features of the media such as
1746 * the capacity, read-only status, etc. USB storage generally does not
1747 * need to be spun up, but if we needed it, this would be the place.
1749 * This call can sleep.
1751 * The return code is not used.
1753 static int ub_bd_revalidate(struct gendisk
*disk
)
1755 struct ub_lun
*lun
= disk
->private_data
;
1757 ub_revalidate(lun
->udev
, lun
);
1759 /* XXX Support sector size switching like in sr.c */
1760 blk_queue_hardsect_size(disk
->queue
, lun
->capacity
.bsize
);
1761 set_capacity(disk
, lun
->capacity
.nsec
);
1762 // set_disk_ro(sdkp->disk, lun->readonly);
1768 * The check is called by the block layer to verify if the media
1769 * is still available. It is supposed to be harmless, lightweight and
1770 * non-intrusive in case the media was not changed.
1772 * This call can sleep.
1774 * The return code is bool!
1776 static int ub_bd_media_changed(struct gendisk
*disk
)
1778 struct ub_lun
*lun
= disk
->private_data
;
1780 if (!lun
->removable
)
1784 * We clean checks always after every command, so this is not
1785 * as dangerous as it looks. If the TEST_UNIT_READY fails here,
1786 * the device is actually not ready with operator or software
1787 * intervention required. One dangerous item might be a drive which
1788 * spins itself down, and come the time to write dirty pages, this
1789 * will fail, then block layer discards the data. Since we never
1790 * spin drives up, such devices simply cannot be used with ub anyway.
1792 if (ub_sync_tur(lun
->udev
, lun
) != 0) {
1797 return lun
->changed
;
1800 static struct block_device_operations ub_bd_fops
= {
1801 .owner
= THIS_MODULE
,
1803 .release
= ub_bd_release
,
1804 .locked_ioctl
= ub_bd_ioctl
,
1805 .media_changed
= ub_bd_media_changed
,
1806 .revalidate_disk
= ub_bd_revalidate
,
1810 * Common ->done routine for commands executed synchronously.
1812 static void ub_probe_done(struct ub_dev
*sc
, struct ub_scsi_cmd
*cmd
)
1814 struct completion
*cop
= cmd
->back
;
1819 * Test if the device has a check condition on it, synchronously.
1821 static int ub_sync_tur(struct ub_dev
*sc
, struct ub_lun
*lun
)
1823 struct ub_scsi_cmd
*cmd
;
1824 enum { ALLOC_SIZE
= sizeof(struct ub_scsi_cmd
) };
1825 unsigned long flags
;
1826 struct completion
compl;
1829 init_completion(&compl);
1832 if ((cmd
= kzalloc(ALLOC_SIZE
, GFP_KERNEL
)) == NULL
)
1835 cmd
->cdb
[0] = TEST_UNIT_READY
;
1837 cmd
->dir
= UB_DIR_NONE
;
1838 cmd
->state
= UB_CMDST_INIT
;
1839 cmd
->lun
= lun
; /* This may be NULL, but that's ok */
1840 cmd
->done
= ub_probe_done
;
1843 spin_lock_irqsave(sc
->lock
, flags
);
1844 cmd
->tag
= sc
->tagcnt
++;
1846 rc
= ub_submit_scsi(sc
, cmd
);
1847 spin_unlock_irqrestore(sc
->lock
, flags
);
1852 wait_for_completion(&compl);
1856 if (rc
== -EIO
&& cmd
->key
!= 0) /* Retries for benh's key */
1866 * Read the SCSI capacity synchronously (for probing).
1868 static int ub_sync_read_cap(struct ub_dev
*sc
, struct ub_lun
*lun
,
1869 struct ub_capacity
*ret
)
1871 struct ub_scsi_cmd
*cmd
;
1872 struct scatterlist
*sg
;
1874 enum { ALLOC_SIZE
= sizeof(struct ub_scsi_cmd
) + 8 };
1875 unsigned long flags
;
1876 unsigned int bsize
, shift
;
1878 struct completion
compl;
1881 init_completion(&compl);
1884 if ((cmd
= kzalloc(ALLOC_SIZE
, GFP_KERNEL
)) == NULL
)
1886 p
= (char *)cmd
+ sizeof(struct ub_scsi_cmd
);
1890 cmd
->dir
= UB_DIR_READ
;
1891 cmd
->state
= UB_CMDST_INIT
;
1894 sg_init_table(sg
, UB_MAX_REQ_SG
);
1895 sg_set_page(sg
, virt_to_page(p
), 8, (unsigned long)p
& (PAGE_SIZE
-1));
1898 cmd
->done
= ub_probe_done
;
1901 spin_lock_irqsave(sc
->lock
, flags
);
1902 cmd
->tag
= sc
->tagcnt
++;
1904 rc
= ub_submit_scsi(sc
, cmd
);
1905 spin_unlock_irqrestore(sc
->lock
, flags
);
1910 wait_for_completion(&compl);
1912 if (cmd
->error
!= 0) {
1916 if (cmd
->act_len
!= 8) {
1921 /* sd.c special-cases sector size of 0 to mean 512. Needed? Safe? */
1922 nsec
= be32_to_cpu(*(__be32
*)p
) + 1;
1923 bsize
= be32_to_cpu(*(__be32
*)(p
+ 4));
1925 case 512: shift
= 0; break;
1926 case 1024: shift
= 1; break;
1927 case 2048: shift
= 2; break;
1928 case 4096: shift
= 3; break;
1935 ret
->bshift
= shift
;
1936 ret
->nsec
= nsec
<< shift
;
1949 static void ub_probe_urb_complete(struct urb
*urb
)
1951 struct completion
*cop
= urb
->context
;
1955 static void ub_probe_timeout(unsigned long arg
)
1957 struct completion
*cop
= (struct completion
*) arg
;
1962 * Reset with a Bulk reset.
1964 static int ub_sync_reset(struct ub_dev
*sc
)
1966 int ifnum
= sc
->intf
->cur_altsetting
->desc
.bInterfaceNumber
;
1967 struct usb_ctrlrequest
*cr
;
1968 struct completion
compl;
1969 struct timer_list timer
;
1972 init_completion(&compl);
1975 cr
->bRequestType
= USB_TYPE_CLASS
| USB_RECIP_INTERFACE
;
1976 cr
->bRequest
= US_BULK_RESET_REQUEST
;
1977 cr
->wValue
= cpu_to_le16(0);
1978 cr
->wIndex
= cpu_to_le16(ifnum
);
1979 cr
->wLength
= cpu_to_le16(0);
1981 usb_fill_control_urb(&sc
->work_urb
, sc
->dev
, sc
->send_ctrl_pipe
,
1982 (unsigned char*) cr
, NULL
, 0, ub_probe_urb_complete
, &compl);
1984 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_KERNEL
)) != 0) {
1986 "%s: Unable to submit a bulk reset (%d)\n", sc
->name
, rc
);
1991 timer
.function
= ub_probe_timeout
;
1992 timer
.data
= (unsigned long) &compl;
1993 timer
.expires
= jiffies
+ UB_CTRL_TIMEOUT
;
1996 wait_for_completion(&compl);
1998 del_timer_sync(&timer
);
1999 usb_kill_urb(&sc
->work_urb
);
2001 return sc
->work_urb
.status
;
2005 * Get number of LUNs by the way of Bulk GetMaxLUN command.
2007 static int ub_sync_getmaxlun(struct ub_dev
*sc
)
2009 int ifnum
= sc
->intf
->cur_altsetting
->desc
.bInterfaceNumber
;
2011 enum { ALLOC_SIZE
= 1 };
2012 struct usb_ctrlrequest
*cr
;
2013 struct completion
compl;
2014 struct timer_list timer
;
2018 init_completion(&compl);
2021 if ((p
= kmalloc(ALLOC_SIZE
, GFP_KERNEL
)) == NULL
)
2026 cr
->bRequestType
= USB_DIR_IN
| USB_TYPE_CLASS
| USB_RECIP_INTERFACE
;
2027 cr
->bRequest
= US_BULK_GET_MAX_LUN
;
2028 cr
->wValue
= cpu_to_le16(0);
2029 cr
->wIndex
= cpu_to_le16(ifnum
);
2030 cr
->wLength
= cpu_to_le16(1);
2032 usb_fill_control_urb(&sc
->work_urb
, sc
->dev
, sc
->recv_ctrl_pipe
,
2033 (unsigned char*) cr
, p
, 1, ub_probe_urb_complete
, &compl);
2035 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_KERNEL
)) != 0)
2039 timer
.function
= ub_probe_timeout
;
2040 timer
.data
= (unsigned long) &compl;
2041 timer
.expires
= jiffies
+ UB_CTRL_TIMEOUT
;
2044 wait_for_completion(&compl);
2046 del_timer_sync(&timer
);
2047 usb_kill_urb(&sc
->work_urb
);
2049 if ((rc
= sc
->work_urb
.status
) < 0)
2052 if (sc
->work_urb
.actual_length
!= 1) {
2055 if ((nluns
= *p
) == 55) {
2058 /* GetMaxLUN returns the maximum LUN number */
2060 if (nluns
> UB_MAX_LUNS
)
2061 nluns
= UB_MAX_LUNS
;
2076 * Clear initial stalls.
2078 static int ub_probe_clear_stall(struct ub_dev
*sc
, int stalled_pipe
)
2081 struct usb_ctrlrequest
*cr
;
2082 struct completion
compl;
2083 struct timer_list timer
;
2086 init_completion(&compl);
2088 endp
= usb_pipeendpoint(stalled_pipe
);
2089 if (usb_pipein (stalled_pipe
))
2093 cr
->bRequestType
= USB_RECIP_ENDPOINT
;
2094 cr
->bRequest
= USB_REQ_CLEAR_FEATURE
;
2095 cr
->wValue
= cpu_to_le16(USB_ENDPOINT_HALT
);
2096 cr
->wIndex
= cpu_to_le16(endp
);
2097 cr
->wLength
= cpu_to_le16(0);
2099 usb_fill_control_urb(&sc
->work_urb
, sc
->dev
, sc
->send_ctrl_pipe
,
2100 (unsigned char*) cr
, NULL
, 0, ub_probe_urb_complete
, &compl);
2102 if ((rc
= usb_submit_urb(&sc
->work_urb
, GFP_KERNEL
)) != 0) {
2104 "%s: Unable to submit a probe clear (%d)\n", sc
->name
, rc
);
2109 timer
.function
= ub_probe_timeout
;
2110 timer
.data
= (unsigned long) &compl;
2111 timer
.expires
= jiffies
+ UB_CTRL_TIMEOUT
;
2114 wait_for_completion(&compl);
2116 del_timer_sync(&timer
);
2117 usb_kill_urb(&sc
->work_urb
);
2119 usb_reset_endpoint(sc
->dev
, endp
);
2125 * Get the pipe settings.
2127 static int ub_get_pipes(struct ub_dev
*sc
, struct usb_device
*dev
,
2128 struct usb_interface
*intf
)
2130 struct usb_host_interface
*altsetting
= intf
->cur_altsetting
;
2131 struct usb_endpoint_descriptor
*ep_in
= NULL
;
2132 struct usb_endpoint_descriptor
*ep_out
= NULL
;
2133 struct usb_endpoint_descriptor
*ep
;
2137 * Find the endpoints we need.
2138 * We are expecting a minimum of 2 endpoints - in and out (bulk).
2139 * We will ignore any others.
2141 for (i
= 0; i
< altsetting
->desc
.bNumEndpoints
; i
++) {
2142 ep
= &altsetting
->endpoint
[i
].desc
;
2144 /* Is it a BULK endpoint? */
2145 if (usb_endpoint_xfer_bulk(ep
)) {
2146 /* BULK in or out? */
2147 if (usb_endpoint_dir_in(ep
)) {
2157 if (ep_in
== NULL
|| ep_out
== NULL
) {
2158 printk(KERN_NOTICE
"%s: failed endpoint check\n", sc
->name
);
2162 /* Calculate and store the pipe values */
2163 sc
->send_ctrl_pipe
= usb_sndctrlpipe(dev
, 0);
2164 sc
->recv_ctrl_pipe
= usb_rcvctrlpipe(dev
, 0);
2165 sc
->send_bulk_pipe
= usb_sndbulkpipe(dev
,
2166 usb_endpoint_num(ep_out
));
2167 sc
->recv_bulk_pipe
= usb_rcvbulkpipe(dev
,
2168 usb_endpoint_num(ep_in
));
2174 * Probing is done in the process context, which allows us to cheat
2175 * and not to build a state machine for the discovery.
2177 static int ub_probe(struct usb_interface
*intf
,
2178 const struct usb_device_id
*dev_id
)
2185 if (usb_usual_check_type(dev_id
, USB_US_TYPE_UB
))
2189 if ((sc
= kzalloc(sizeof(struct ub_dev
), GFP_KERNEL
)) == NULL
)
2191 sc
->lock
= ub_next_lock();
2192 INIT_LIST_HEAD(&sc
->luns
);
2193 usb_init_urb(&sc
->work_urb
);
2194 tasklet_init(&sc
->tasklet
, ub_scsi_action
, (unsigned long)sc
);
2195 atomic_set(&sc
->poison
, 0);
2196 INIT_WORK(&sc
->reset_work
, ub_reset_task
);
2197 init_waitqueue_head(&sc
->reset_wait
);
2199 init_timer(&sc
->work_timer
);
2200 sc
->work_timer
.data
= (unsigned long) sc
;
2201 sc
->work_timer
.function
= ub_urb_timeout
;
2203 ub_init_completion(&sc
->work_done
);
2204 sc
->work_done
.done
= 1; /* A little yuk, but oh well... */
2206 sc
->dev
= interface_to_usbdev(intf
);
2208 // sc->ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
2209 usb_set_intfdata(intf
, sc
);
2210 usb_get_dev(sc
->dev
);
2212 * Since we give the interface struct to the block level through
2213 * disk->driverfs_dev, we have to pin it. Otherwise, block_uevent
2214 * oopses on close after a disconnect (kernels 2.6.16 and up).
2216 usb_get_intf(sc
->intf
);
2218 snprintf(sc
->name
, 12, DRV_NAME
"(%d.%d)",
2219 sc
->dev
->bus
->busnum
, sc
->dev
->devnum
);
2221 /* XXX Verify that we can handle the device (from descriptors) */
2223 if (ub_get_pipes(sc
, sc
->dev
, intf
) != 0)
2227 * At this point, all USB initialization is done, do upper layer.
2228 * We really hate halfway initialized structures, so from the
2229 * invariants perspective, this ub_dev is fully constructed at
2234 * This is needed to clear toggles. It is a problem only if we do
2235 * `rmmod ub && modprobe ub` without disconnects, but we like that.
2237 #if 0 /* iPod Mini fails if we do this (big white iPod works) */
2238 ub_probe_clear_stall(sc
, sc
->recv_bulk_pipe
);
2239 ub_probe_clear_stall(sc
, sc
->send_bulk_pipe
);
2243 * The way this is used by the startup code is a little specific.
2244 * A SCSI check causes a USB stall. Our common case code sees it
2245 * and clears the check, after which the device is ready for use.
2246 * But if a check was not present, any command other than
2247 * TEST_UNIT_READY ends with a lockup (including REQUEST_SENSE).
2249 * If we neglect to clear the SCSI check, the first real command fails
2250 * (which is the capacity readout). We clear that and retry, but why
2251 * causing spurious retries for no reason.
2253 * Revalidation may start with its own TEST_UNIT_READY, but that one
2254 * has to succeed, so we clear checks with an additional one here.
2255 * In any case it's not our business how revaliadation is implemented.
2257 for (i
= 0; i
< 3; i
++) { /* Retries for the schwag key from KS'04 */
2258 if ((rc
= ub_sync_tur(sc
, NULL
)) <= 0) break;
2259 if (rc
!= 0x6) break;
2264 for (i
= 0; i
< 3; i
++) {
2265 if ((rc
= ub_sync_getmaxlun(sc
)) < 0)
2274 for (i
= 0; i
< nluns
; i
++) {
2275 ub_probe_lun(sc
, i
);
2280 usb_set_intfdata(intf
, NULL
);
2281 usb_put_intf(sc
->intf
);
2282 usb_put_dev(sc
->dev
);
2288 static int ub_probe_lun(struct ub_dev
*sc
, int lnum
)
2291 struct request_queue
*q
;
2292 struct gendisk
*disk
;
2296 if ((lun
= kzalloc(sizeof(struct ub_lun
), GFP_KERNEL
)) == NULL
)
2301 if ((lun
->id
= ub_id_get()) == -1)
2306 snprintf(lun
->name
, 16, DRV_NAME
"%c(%d.%d.%d)",
2307 lun
->id
+ 'a', sc
->dev
->bus
->busnum
, sc
->dev
->devnum
, lun
->num
);
2309 lun
->removable
= 1; /* XXX Query this from the device */
2310 lun
->changed
= 1; /* ub_revalidate clears only */
2311 ub_revalidate(sc
, lun
);
2314 if ((disk
= alloc_disk(UB_PARTS_PER_LUN
)) == NULL
)
2317 sprintf(disk
->disk_name
, DRV_NAME
"%c", lun
->id
+ 'a');
2318 disk
->major
= UB_MAJOR
;
2319 disk
->first_minor
= lun
->id
* UB_PARTS_PER_LUN
;
2320 disk
->fops
= &ub_bd_fops
;
2321 disk
->private_data
= lun
;
2322 disk
->driverfs_dev
= &sc
->intf
->dev
;
2325 if ((q
= blk_init_queue(ub_request_fn
, sc
->lock
)) == NULL
)
2330 blk_queue_bounce_limit(q
, BLK_BOUNCE_HIGH
);
2331 blk_queue_max_hw_segments(q
, UB_MAX_REQ_SG
);
2332 blk_queue_max_phys_segments(q
, UB_MAX_REQ_SG
);
2333 blk_queue_segment_boundary(q
, 0xffffffff); /* Dubious. */
2334 blk_queue_max_sectors(q
, UB_MAX_SECTORS
);
2335 blk_queue_hardsect_size(q
, lun
->capacity
.bsize
);
2339 list_add(&lun
->link
, &sc
->luns
);
2341 set_capacity(disk
, lun
->capacity
.nsec
);
2343 disk
->flags
|= GENHD_FL_REMOVABLE
;
2359 static void ub_disconnect(struct usb_interface
*intf
)
2361 struct ub_dev
*sc
= usb_get_intfdata(intf
);
2363 unsigned long flags
;
2366 * Prevent ub_bd_release from pulling the rug from under us.
2367 * XXX This is starting to look like a kref.
2368 * XXX Why not to take this ref at probe time?
2370 spin_lock_irqsave(&ub_lock
, flags
);
2372 spin_unlock_irqrestore(&ub_lock
, flags
);
2375 * Fence stall clearings, operations triggered by unlinkings and so on.
2376 * We do not attempt to unlink any URBs, because we do not trust the
2377 * unlink paths in HC drivers. Also, we get -84 upon disconnect anyway.
2379 atomic_set(&sc
->poison
, 1);
2382 * Wait for reset to end, if any.
2384 wait_event(sc
->reset_wait
, !sc
->reset
);
2387 * Blow away queued commands.
2389 * Actually, this never works, because before we get here
2390 * the HCD terminates outstanding URB(s). It causes our
2391 * SCSI command queue to advance, commands fail to submit,
2392 * and the whole queue drains. So, we just use this code to
2395 spin_lock_irqsave(sc
->lock
, flags
);
2397 struct ub_scsi_cmd
*cmd
;
2399 while ((cmd
= ub_cmdq_peek(sc
)) != NULL
) {
2400 cmd
->error
= -ENOTCONN
;
2401 cmd
->state
= UB_CMDST_DONE
;
2403 (*cmd
->done
)(sc
, cmd
);
2407 printk(KERN_WARNING
"%s: "
2408 "%d was queued after shutdown\n", sc
->name
, cnt
);
2411 spin_unlock_irqrestore(sc
->lock
, flags
);
2414 * Unregister the upper layer.
2416 list_for_each_entry(lun
, &sc
->luns
, link
) {
2417 del_gendisk(lun
->disk
);
2419 * I wish I could do:
2420 * queue_flag_set(QUEUE_FLAG_DEAD, q);
2421 * As it is, we rely on our internal poisoning and let
2422 * the upper levels to spin furiously failing all the I/O.
2427 * Testing for -EINPROGRESS is always a bug, so we are bending
2428 * the rules a little.
2430 spin_lock_irqsave(sc
->lock
, flags
);
2431 if (sc
->work_urb
.status
== -EINPROGRESS
) { /* janitors: ignore */
2432 printk(KERN_WARNING
"%s: "
2433 "URB is active after disconnect\n", sc
->name
);
2435 spin_unlock_irqrestore(sc
->lock
, flags
);
2438 * There is virtually no chance that other CPU runs a timeout so long
2439 * after ub_urb_complete should have called del_timer, but only if HCD
2440 * didn't forget to deliver a callback on unlink.
2442 del_timer_sync(&sc
->work_timer
);
2445 * At this point there must be no commands coming from anyone
2446 * and no URBs left in transit.
2452 static struct usb_driver ub_driver
= {
2455 .disconnect
= ub_disconnect
,
2456 .id_table
= ub_usb_ids
,
2457 .pre_reset
= ub_pre_reset
,
2458 .post_reset
= ub_post_reset
,
2461 static int __init
ub_init(void)
2466 for (i
= 0; i
< UB_QLOCK_NUM
; i
++)
2467 spin_lock_init(&ub_qlockv
[i
]);
2469 if ((rc
= register_blkdev(UB_MAJOR
, DRV_NAME
)) != 0)
2472 if ((rc
= usb_register(&ub_driver
)) != 0)
2475 usb_usual_set_present(USB_US_TYPE_UB
);
2479 unregister_blkdev(UB_MAJOR
, DRV_NAME
);
2484 static void __exit
ub_exit(void)
2486 usb_deregister(&ub_driver
);
2488 unregister_blkdev(UB_MAJOR
, DRV_NAME
);
2489 usb_usual_clear_present(USB_US_TYPE_UB
);
2492 module_init(ub_init
);
2493 module_exit(ub_exit
);
2495 MODULE_LICENSE("GPL");