[PATCH 4.19 077/267] scsi: megaraid_sas: TM command refire leads to controller firmware crash

Greg Kroah-Hartman
2020-06-19T16:27:14Z

From: Sumit Saxena <sumit.saxena@broadcom.com>

commit 6fd8525a70221c26823b1c7e912fb21f218fb0c5 upstream.

When TM command times out, driver invokes the controller reset. Post reset,
driver re-fires pended TM commands which leads to firmware crash.

Post controller reset, return pended TM commands back to OS.

Link: https://lore.kernel.org/r/20200508085242.23406-1-chandrakanth.patil@broadcom.com
Cc: stable@vger.kernel.org
Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Chandrakanth Patil <chandrakanth.patil@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/scsi/megaraid/megaraid_sas_fusion.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -3940,6 +3940,7 @@ void megasas_refire_mgmt_cmd(struct mega
struct fusion_context *fusion;
struct megasas_cmd *cmd_mfi;
union MEGASAS_REQUEST_DESCRIPTOR_UNION *req_desc;
+ struct MPI2_RAID_SCSI_IO_REQUEST *scsi_io_req;
u16 smid;
bool refire_cmd = 0;
u8 result;
@@ -3990,6 +3991,11 @@ void megasas_refire_mgmt_cmd(struct mega
break;
}

+ scsi_io_req = (struct MPI2_RAID_SCSI_IO_REQUEST *)
+ cmd_fusion->io_request;
+ if (scsi_io_req->Function == MPI2_FUNCTION_SCSI_TASK_MGMT)
+ result = RETURN_CMD;
+
switch (result) {
case REFIRE_CMD:
megasas_fire_cmd_fusion(instance, req_desc);
@@ -4187,7 +4193,6 @@ megasas_issue_tm(struct megasas_instance
if (!timeleft) {
dev_err(&instance->pdev->dev,
"task mgmt type 0x%x timed out\n", type);
- cmd_mfi->flags |= DRV_DCMD_SKIP_REFIRE;
mutex_unlock(&instance->reset_mutex);
rc = megasas_reset_fusion(instance->host, MFI_IO_TIMEOUT_OCR);
mutex_lock(&instance->reset_mutex);