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scsi: smartpqi: fix rare system hang during LUN reset

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Correct a rare case where in a LUN reset occurs on a device and I/O
requests for other devices persist in the driver's internal request queue.

Part of a LUN reset involves waiting for our internal request queue to
empty before proceeding. The internal request queue contains requests not
yet sent down to the controller.

We were clearing the requests queued for the LUN undergoing a reset, but
not all of the queued requests. Causing a hang.

For all requests in our internal request queue:

   Complete requests with DID_RESET for queued requests for the device
   undergoing a reset.

   Complete requests with DID_REQUEUE for all other queued requests.

Reviewed-by: Scott Benesh <scott.benesh@microchip.com>
Reviewed-by: Scott Teel <scott.teel@microchip.com>
Reviewed-by: Mike McGowen <mike.mcgowen@microchip.com>
Signed-off-by: Murthy Bhat <Murthy.Bhat@microchip.com>
Signed-off-by: Don Brace <don.brace@microchip.com>
Link: https://lore.kernel.org/r/20240827185501.692804-6-don.brace@microchip.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Murthy Bhat 2024-08-27 13:54:59 -05:00 committed by Martin K. Petersen
parent dbc39b8454
commit 4e0a51716d
1 changed files with 4 additions and 6 deletions
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10
drivers/scsi/smartpqi/smartpqi_init.c
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@ -6200,14 +6200,12 @@ static void pqi_fail_io_queued_for_device(struct pqi_ctrl_info *ctrl_info,
continue;
scsi_device = scmd->device->hostdata;
if (scsi_device != device)
continue;
if ((u8)scmd->device->lun != lun)
continue;
list_del(&io_request->request_list_entry);
set_host_byte(scmd, DID_RESET);
if (scsi_device == device && (u8)scmd->device->lun == lun)
set_host_byte(scmd, DID_RESET);
else
set_host_byte(scmd, DID_REQUEUE);
pqi_free_io_request(io_request);
scsi_dma_unmap(scmd);
pqi_scsi_done(scmd);