linux-kernel - [PATCH 5.4 110/134] scsi: megaraid_sas: TM command refire leads to controller firmware crash

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Date:   Tue, 16 Jun 2020 17:34:54 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sumit Saxena <sumit.saxena@...adcom.com>,
        Chandrakanth Patil <chandrakanth.patil@...adcom.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 5.4 110/134] scsi: megaraid_sas: TM command refire leads to controller firmware crash

From: Sumit Saxena <sumit.saxena@...adcom.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@...r.kernel.org
Signed-off-by: Sumit Saxena <sumit.saxena@...adcom.com>
Signed-off-by: Chandrakanth Patil <chandrakanth.patil@...adcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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
@@ -4227,6 +4227,7 @@ static void megasas_refire_mgmt_cmd(stru
 	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;
@@ -4284,6 +4285,11 @@ static void megasas_refire_mgmt_cmd(stru
 			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);
@@ -4481,7 +4487,6 @@ 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);