From: Martin K. Petersen <martin.petersen@oracle.com>
Date: Sun, 15 Apr 2012 03:01:28 +0000 (-0400)
Subject: SCSI: Fix error handling when no ULD is attached
X-Git-Tag: v3.4-rc3~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=919f797a4c9c22ff5ec059744dba364dc600ece2;p=pandora-kernel.git

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>
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