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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - drivers/staging/usbip/vhci_rx.c
2 * Copyright (C) 2003-2008 Takahiro Hirofuchi
4 * This is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
20 #include <linux/slab.h>
22 #include "usbip_common.h"
26 /* get URB from transmitted urb queue */
27 static struct urb
*pickup_urb_and_free_priv(struct vhci_device
*vdev
,
30 struct vhci_priv
*priv
, *tmp
;
31 struct urb
*urb
= NULL
;
34 spin_lock(&vdev
->priv_lock
);
36 list_for_each_entry_safe(priv
, tmp
, &vdev
->priv_rx
, list
) {
37 if (priv
->seqnum
== seqnum
) {
41 usbip_dbg_vhci_rx("find urb %p vurb %p seqnum %u\n",
44 /* TODO: fix logic here to improve indent situtation */
45 if (status
!= -EINPROGRESS
) {
46 if (status
== -ENOENT
||
47 status
== -ECONNRESET
)
48 dev_info(&urb
->dev
->dev
,
49 "urb %p was unlinked "
50 "%ssynchronuously.\n", urb
,
51 status
== -ENOENT
? "" : "a");
53 dev_info(&urb
->dev
->dev
,
54 "urb %p may be in a error, "
55 "status %d\n", urb
, status
);
58 list_del(&priv
->list
);
66 spin_unlock(&vdev
->priv_lock
);
71 static void vhci_recv_ret_submit(struct vhci_device
*vdev
,
72 struct usbip_header
*pdu
)
74 struct usbip_device
*ud
= &vdev
->ud
;
78 urb
= pickup_urb_and_free_priv(vdev
, pdu
->base
.seqnum
);
82 usbip_uerr("cannot find a urb of seqnum %u\n",
84 usbip_uinfo("max seqnum %d\n",
85 atomic_read(&the_controller
->seqnum
));
86 usbip_event_add(ud
, VDEV_EVENT_ERROR_TCP
);
91 /* unpack the pdu to a urb */
92 usbip_pack_pdu(pdu
, urb
, USBIP_RET_SUBMIT
, 0);
95 /* recv transfer buffer */
96 if (usbip_recv_xbuff(ud
, urb
) < 0)
100 /* recv iso_packet_descriptor */
101 if (usbip_recv_iso(ud
, urb
) < 0)
105 if (usbip_dbg_flag_vhci_rx
)
109 usbip_dbg_vhci_rx("now giveback urb %p\n", urb
);
111 spin_lock(&the_controller
->lock
);
112 usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller
), urb
);
113 spin_unlock(&the_controller
->lock
);
115 usb_hcd_giveback_urb(vhci_to_hcd(the_controller
), urb
, urb
->status
);
118 usbip_dbg_vhci_rx("Leave\n");
124 static struct vhci_unlink
*dequeue_pending_unlink(struct vhci_device
*vdev
,
125 struct usbip_header
*pdu
)
127 struct vhci_unlink
*unlink
, *tmp
;
129 spin_lock(&vdev
->priv_lock
);
131 list_for_each_entry_safe(unlink
, tmp
, &vdev
->unlink_rx
, list
) {
132 usbip_uinfo("unlink->seqnum %lu\n", unlink
->seqnum
);
133 if (unlink
->seqnum
== pdu
->base
.seqnum
) {
134 usbip_dbg_vhci_rx("found pending unlink, %lu\n",
136 list_del(&unlink
->list
);
138 spin_unlock(&vdev
->priv_lock
);
143 spin_unlock(&vdev
->priv_lock
);
149 static void vhci_recv_ret_unlink(struct vhci_device
*vdev
,
150 struct usbip_header
*pdu
)
152 struct vhci_unlink
*unlink
;
155 usbip_dump_header(pdu
);
157 unlink
= dequeue_pending_unlink(vdev
, pdu
);
159 usbip_uinfo("cannot find the pending unlink %u\n",
164 urb
= pickup_urb_and_free_priv(vdev
, unlink
->unlink_seqnum
);
167 * I get the result of a unlink request. But, it seems that I
168 * already received the result of its submit result and gave
171 usbip_uinfo("the urb (seqnum %d) was already given backed\n",
174 usbip_dbg_vhci_rx("now giveback urb %p\n", urb
);
176 /* If unlink is succeed, status is -ECONNRESET */
177 urb
->status
= pdu
->u
.ret_unlink
.status
;
178 usbip_uinfo("%d\n", urb
->status
);
180 spin_lock(&the_controller
->lock
);
181 usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller
), urb
);
182 spin_unlock(&the_controller
->lock
);
184 usb_hcd_giveback_urb(vhci_to_hcd(the_controller
), urb
,
194 static void vhci_rx_pdu(struct usbip_device
*ud
)
197 struct usbip_header pdu
;
198 struct vhci_device
*vdev
= container_of(ud
, struct vhci_device
, ud
);
201 usbip_dbg_vhci_rx("Enter\n");
203 memset(&pdu
, 0, sizeof(pdu
));
206 /* 1. receive a pdu header */
207 ret
= usbip_xmit(0, ud
->tcp_socket
, (char *) &pdu
, sizeof(pdu
), 0);
208 if (ret
!= sizeof(pdu
)) {
209 usbip_uerr("receiving pdu failed! size is %d, should be %d\n",
210 ret
, (unsigned int)sizeof(pdu
));
211 usbip_event_add(ud
, VDEV_EVENT_ERROR_TCP
);
215 usbip_header_correct_endian(&pdu
, 0);
217 if (usbip_dbg_flag_vhci_rx
)
218 usbip_dump_header(&pdu
);
220 switch (pdu
.base
.command
) {
221 case USBIP_RET_SUBMIT
:
222 vhci_recv_ret_submit(vdev
, &pdu
);
224 case USBIP_RET_UNLINK
:
225 vhci_recv_ret_unlink(vdev
, &pdu
);
229 usbip_uerr("unknown pdu %u\n", pdu
.base
.command
);
230 usbip_dump_header(&pdu
);
231 usbip_event_add(ud
, VDEV_EVENT_ERROR_TCP
);
236 /*-------------------------------------------------------------------------*/
238 void vhci_rx_loop(struct usbip_task
*ut
)
240 struct usbip_device
*ud
= container_of(ut
, struct usbip_device
, tcp_rx
);
244 if (signal_pending(current
)) {
245 usbip_dbg_vhci_rx("signal catched!\n");
250 if (usbip_event_happened(ud
))