scsi: megaraid_sas: Fix data integrity failure for JBOD (passthrough) devices
authorKashyap Desai <kashyap.desai@broadcom.com>
Fri, 21 Oct 2016 13:33:32 +0000 (06:33 -0700)
committerMartin K. Petersen <martin.petersen@oracle.com>
Tue, 25 Oct 2016 01:31:43 +0000 (21:31 -0400)
commit1e793f6fc0db920400574211c48f9157a37e3945
tree5c2b23a174bd21b90c81e34f7ebfe265e8468077
parent77f18a87186a87cab2a027335758a7244896084c
scsi: megaraid_sas: Fix data integrity failure for JBOD (passthrough) devices

Commit 02b01e010afe ("megaraid_sas: return sync cache call with
success") modified the driver to successfully complete SYNCHRONIZE_CACHE
commands without passing them to the controller. Disk drive caches are
only explicitly managed by controller firmware when operating in RAID
mode. So this commit effectively disabled writeback cache flushing for
any drives used in JBOD mode, leading to data integrity failures.

[mkp: clarified patch description]

Fixes: 02b01e010afeeb49328d35650d70721d2ca3fd59
CC: stable@vger.kernel.org
Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Ewan D. Milne <emilne@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
drivers/scsi/megaraid/megaraid_sas_base.c