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authorMartin K. Petersen <martin.petersen@oracle.com>2012-04-14 23:01:28 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-04-15 11:08:53 -0700
commit919f797a4c9c22ff5ec059744dba364dc600ece2 (patch)
tree6f2183e84c2bcfdc6eebed82319a4a21b871bdea /include/scsi/scsi_cmnd.h
parentbfecc60d8f6715ec6b38aa29c4f5a3570415dae0 (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>
Diffstat (limited to 'include/scsi/scsi_cmnd.h')
-rw-r--r--include/scsi/scsi_cmnd.h3
1 files changed, 3 insertions, 0 deletions
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;
}