SCSI: Fix error handling when no ULD is attached
authorMartin K. Petersen <martin.petersen@oracle.com>
Sun, 15 Apr 2012 03:01:28 +0000 (23:01 -0400)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sun, 15 Apr 2012 18:08:53 +0000 (11:08 -0700)
commit919f797a4c9c22ff5ec059744dba364dc600ece2
tree6f2183e84c2bcfdc6eebed82319a4a21b871bdea
parentbfecc60d8f6715ec6b38aa29c4f5a3570415dae0
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>
drivers/scsi/scsi_error.c
include/scsi/scsi_cmnd.h