From: Sumant Patro <sumantp@lsil.com>

FW does not support SYNCHRONIZE_CACHE cmd.  FW flush cache on its own.  So, we
just return success from the megasas_queue_command.

Signed-off-by: Sumant Patro <sumant.patro@lsi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/scsi/megaraid/megaraid_sas.c |   12 ++++++++++++
 1 file changed, 12 insertions(+)

diff -puN drivers/scsi/megaraid/megaraid_sas.c~scsi-megaraid_sas-return-sync-cache-call-with-success drivers/scsi/megaraid/megaraid_sas.c
--- a/drivers/scsi/megaraid/megaraid_sas.c~scsi-megaraid_sas-return-sync-cache-call-with-success
+++ a/drivers/scsi/megaraid/megaraid_sas.c
@@ -857,6 +857,18 @@ megasas_queue_command(struct scsi_cmnd *
 		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
+			 */
+			scmd->result = DID_OK << 16;
+			goto out_done;
+		default:
+			break;
+	}
+
 	/* Check if we can accept cmds */
 	if (instance->is_busy) {
 		sec = (jiffies - instance->last_time) / HZ;
_