diff options
| author | Martin K. Petersen <martin.petersen@oracle.com> | 2012-04-14 23:01:28 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-04-15 11:08:53 -0700 |
| commit | 919f797a4c9c22ff5ec059744dba364dc600ece2 (patch) | |
| tree | 6f2183e84c2bcfdc6eebed82319a4a21b871bdea | |
| parent | bfecc60d8f6715ec6b38aa29c4f5a3570415dae0 (diff) | |
SCSI: Fix error handling when no ULD is attached
Commit 18a4d0a22ed6 ("[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>
| -rw-r--r-- | drivers/scsi/scsi_error.c | 2 | ||||
| -rw-r--r-- | include/scsi/scsi_cmnd.h | 3 |
2 files changed, 4 insertions, 1 deletions
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index 2cfcbffa41fd..386f0c53bea7 100644 --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -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; diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h index 377df4a28512..1e1198546c72 100644 --- a/include/scsi/scsi_cmnd.h +++ b/include/scsi/scsi_cmnd.h @@ -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; } |