diff mbox series

[V2,10/16] smartpqi: fix dma direction for RAID requests

Message ID 165730605618.177165.9054223644512926624.stgit@brunhilda
State New
Headers show
Series smartpqi updates | expand

Commit Message

Don Brace July 8, 2022, 6:47 p.m. UTC 
From: Mahesh Rajashekhara <Mahesh.Rajashekhara@microchip.com>

Correct a SOP READ and WRITE DMA flags for some requests.

This update corrects DMA direction issues with SCSI commands removed
from the controller's internal lookup table.

Currently, SCSI READ BLOCK LIMITS (0x5) was removed from the controller
lookup table and exposed a DMA direction flag issue.

SCSI READ BLOCK LIMITS was recently removed from our controller lookup
table so the controller uses the respective IU flag field to set the DMA
data direction. Since the DMA direction is incorrect the FW never
completes the request causing a hang.

Some SCSI commands which use SCSI READ BLOCK LIMITS
      * sg_map
      * mt -f /dev/stX status

Note: Customers after updating controller FW may notice their tape units
      failing. This patch resolves the issue.

      Also, the AIO path DMA direction is correct.

The DMA direction flag is a day-one bug with no reported BZ.
Fixes: 6c223761eb54 smartpqi: initial commit of Microsemi smartpqi driver

Reviewed-by: Scott Benesh <scott.benesh@microchip.com>
Reviewed-by: Scott Teel <scott.teel@microchip.com>
Reviewed-by: Mike McGowen <mike.mcgowen@microchip.com>
Reviewed-by: Kevin Barnett <kevin.barnett@microchip.com>
Signed-off-by: Mahesh Rajashekhara <Mahesh.Rajashekhara@microchip.com>
Signed-off-by: Don Brace <don.brace@microchip.com>
---
 drivers/scsi/smartpqi/smartpqi_init.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c
index 96b206ab5ecf..51b5a11efa9c 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -5500,10 +5500,10 @@  static int pqi_raid_submit_scsi_cmd_with_io_request(
 	}
 
 	switch (scmd->sc_data_direction) {
-	case DMA_TO_DEVICE:
+	case DMA_FROM_DEVICE:
 		request->data_direction = SOP_READ_FLAG;
 		break;
-	case DMA_FROM_DEVICE:
+	case DMA_TO_DEVICE:
 		request->data_direction = SOP_WRITE_FLAG;
 		break;
 	case DMA_NONE: