tree 6f2183e84c2bcfdc6eebed82319a4a21b871bdea
parent bfecc60d8f6715ec6b38aa29c4f5a3570415dae0
author Martin K. Petersen <martin.petersen@oracle.com> 1334458888 -0400
committer Linus Torvalds <torvalds@linux-foundation.org> 1334513333 -0700

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>