scsi: core: save/restore command resid for error handling

BugLink: https://bugs.launchpad.net/bugs/1851876
commit 8f8fed0cdbbd6cdbf28d9ebe662f45765d2f7d39 upstream.

When a non-passthrough command is terminated with CHECK CONDITION, request
sense is executed by hijacking the command descriptor. Since
scsi_eh_prep_cmnd() and scsi_eh_restore_cmnd() do not save/restore the
original command resid, the value returned on failure of the original
command is lost and replaced with the value set by the execution of the
request sense command. This value may in many instances be unaligned to the
device sector size, causing sd_done() to print a warning message about the
incorrect unaligned resid before the command is retried.

Fix this problem by saving the original command residual in struct
scsi_eh_save using scsi_eh_prep_cmnd() and restoring it in
scsi_eh_restore_cmnd(). In addition, to make sure that the request sense
command is executed with a correctly initialized command structure, also
reset the residual to 0 in scsi_eh_prep_cmnd() after saving the original
command value in struct scsi_eh_save.

Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20191001074839.1994-1-damien.lemoal@wdc.com
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 61628581c6a21239530b0bbb22f8388c8a31f335..1272fa454ea1c4989cdd14edc83eab8211fc164c 100644 (file)
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -942,6 +942,7 @@ void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses,
        ses->sdb = scmd->sdb;
        ses->next_rq = scmd->request->next_rq;
        ses->result = scmd->result;
+       ses->resid_len = scmd->req.resid_len;
        ses->underflow = scmd->underflow;
        ses->prot_op = scmd->prot_op;
        ses->eh_eflags = scmd->eh_eflags;
@@ -953,6 +954,7 @@ void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses,
        memset(&scmd->sdb, 0, sizeof(scmd->sdb));
        scmd->request->next_rq = NULL;
        scmd->result = 0;
+       scmd->req.resid_len = 0;
 
        if (sense_bytes) {
                scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE,
@@ -1006,6 +1008,7 @@ void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses)
        scmd->sdb = ses->sdb;
        scmd->request->next_rq = ses->next_rq;
        scmd->result = ses->result;
+       scmd->req.resid_len = ses->resid_len;
        scmd->underflow = ses->underflow;
        scmd->prot_op = ses->prot_op;
        scmd->eh_eflags = ses->eh_eflags;

diff --git a/include/scsi/scsi_eh.h b/include/scsi/scsi_eh.h
index 2b7e227960e1602123aecf88b11f9be00e975655..91f403341dd7a2cbafe2b8a6d3159687e538efcb 100644 (file)
--- a/include/scsi/scsi_eh.h
+++ b/include/scsi/scsi_eh.h
@@ -32,6 +32,7 @@ extern int scsi_ioctl_reset(struct scsi_device *, int __user *);
 struct scsi_eh_save {
        /* saved state */
        int result;
+       unsigned int resid_len;
        int eh_eflags;
        enum dma_data_direction data_direction;
        unsigned underflow;