scsi: smartpqi: Add SCSI cmd info for resets

Report on SCSI command that has triggered the reset.  Also add check for
NULL SCSI commands resulting from issuing sg_reset when there is no
outstanding commands.

   Example:

   sg_reset -d /dev/sgXY
   smartpqi 0000:39:00.0: resetting scsi 4:0:1:0 due to cmd 0x12

Link: https://lore.kernel.org/r/20210714182847.50360-6-don.brace@microchip.comReviewed-by: Kevin Barnett <kevin.barnett@microchip.com>
Reviewed-by: Mike McGowen <mike.mcgowen@microchip.com>
Reviewed-by: Scott Benesh <scott.benesh@microchip.com>
Reviewed-by: Scott Teel <scott.teel@microchip.com>
Signed-off-by: Murthy Bhat <Murthy.Bhat@microchip.com>
Signed-off-by: Don Brace <don.brace@microchip.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/smartpqi/smartpqi_init.c

@@ -6033,8 +6033,10 @@ static int pqi_eh_device_reset_handler(struct scsi_cmnd *scmd)
 	mutex_lock(&ctrl_info->lun_reset_mutex);
 
 	dev_err(&ctrl_info->pci_dev->dev,
-		"resetting scsi %d:%d:%d:%d\n",
-		shost->host_no, device->bus, device->target, device->lun);
+		"resetting scsi %d:%d:%d:%d due to cmd 0x%02x\n",
+		shost->host_no,
+		device->bus, device->target, device->lun,
+		scmd->cmd_len > 0 ? scmd->cmnd[0] : 0xff);
 
 	pqi_check_ctrl_health(ctrl_info);
 	if (pqi_ctrl_offline(ctrl_info))