qla2xxx: Add mutex around optrom calls to serialize accesses.

commit 7a8ab9c840b5dff9bb70328338a86444ed1c2415 upstream.

Signed-off-by: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: Saurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --cc drivers/scsi/qla2xxx/qla_attr.c
Simple merge

diff --cc drivers/scsi/qla2xxx/qla_bsg.c
Simple merge

diff --cc drivers/scsi/qla2xxx/qla_def.h
Simple merge

diff --cc drivers/scsi/qla2xxx/qla_os.c
Simple merge