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SCSI: Fix error handling when no ULD is attached 

Commit 18a4d0a22e ("[SCSI] Handle disk devices which can not process
medium access commands") introduced a bug in which we would attempt to
dereference the scsi driver even when the device had no ULD attached.

Ensure that a driver is registered and make the driver accessor function
more resilient to errors during device discovery.

Reported-by: Elric Fu <elricfu1@gmail.com>
Reported-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Martin K. Petersen 2012-04-14 23:01:28 -04:00 committed by Linus Torvalds
parent bfecc60d8f
commit 919f797a4c
2 changed files with 4 additions and 1 deletions
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2
drivers/scsi/scsi_error.c
View File

@ -835,7 +835,7 @@ static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd,
scsi_eh_restore_cmnd(scmd, &ses);
if (sdrv->eh_action)
if (sdrv && sdrv->eh_action)
rtn = sdrv->eh_action(scmd, cmnd, cmnd_size, rtn);
return rtn;

3
include/scsi/scsi_cmnd.h
View File

@ -134,6 +134,9 @@ struct scsi_cmnd {
static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd)
{
if (!cmd->request->rq_disk)
return NULL;
return *(struct scsi_driver **)cmd->request->rq_disk->private_data;
}