scsi: smartpqi: Remove timeouts from internal cmds

Remove timeouts for driver-initiated commands. Responses to internal
requests can take longer than hard coded timeout values and the driver will
still have an outstanding request that may complete in the future with no
context.

Link: https://lore.kernel.org/r/161549377451.25025.12306492868851801623.stgit@brunhildaReviewed-by: Scott Benesh <scott.benesh@microchip.com>
Reviewed-by: Mike McGowen <mike.mcgowen@microchip.com>
Reviewed-by: Scott Teel <scott.teel@microchip.com>
Signed-off-by: Kevin Barnett <kevin.barnett@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.h

@@ -130,9 +130,12 @@ struct pqi_iu_header {
 				/* of this header */
 	__le16	response_queue_id;	/* specifies the OQ where the */
 					/* response IU is to be delivered */
-	u8	work_area[2];	/* reserved for driver use */
+	u16	driver_flags;	/* reserved for driver use */
 };
 
+/* manifest constants for pqi_iu_header.driver_flags */
+#define PQI_DRIVER_NONBLOCKABLE_REQUEST		0x1
+
 /*
  * According to the PQI spec, the IU header is only the first 4 bytes of our
  * pqi_iu_header structure.