Commit 9a9a2373 authored by Kashyap Desai's avatar Kashyap Desai Committed by Sasha Levin

scsi: megaraid_sas: Fix data integrity failure for JBOD (passthrough) devices

[ Upstream commit 1e793f6f ]

Commit 02b01e01 ("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: 02b01e01
CC: stable@vger.kernel.org
Signed-off-by: default avatarKashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: default avatarSumit Saxena <sumit.saxena@broadcom.com>
Reviewed-by: default avatarTomas Henzl <thenzl@redhat.com>
Reviewed-by: default avatarHannes Reinecke <hare@suse.com>
Reviewed-by: default avatarEwan D. Milne <emilne@redhat.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
parent 1b15bd73
......@@ -1622,16 +1622,13 @@ megasas_queue_command(struct Scsi_Host *shost, struct scsi_cmnd *scmd)
goto out_done;
}
switch (scmd->cmnd[0]) {
case SYNCHRONIZE_CACHE:
/*
* FW takes care of flush cache on its own
* No need to send it down
* FW takes care of flush cache on its own for Virtual Disk.
* No need to send it down for VD. For JBOD send SYNCHRONIZE_CACHE to FW.
*/
if ((scmd->cmnd[0] == SYNCHRONIZE_CACHE) && MEGASAS_IS_LOGICAL(scmd)) {
scmd->result = DID_OK << 16;
goto out_done;
default:
break;
}
if (instance->instancet->build_and_issue_cmd(instance, scmd)) {
......
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