scsi: smartpqi: Update volume size after expansion

After modifying logical volume size, lsblk command still shows previous
size of logical volume.

When the driver gets any event from firmware it schedules rescan worker
with delay of 10 seconds. If array expansion is so quick that it gets
completed in a second, the driver could not catch logical volume expansion
due to worker delay.

Since driver does not detect volume expansion, driver would not call
rescan device to update new size to the OS.

Link: https://lore.kernel.org/r/164375211833.440833.17023155389220583731.stgit@brunhilda.pdev.netReviewed-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: Mahesh Rajashekhara <mahesh.rajashekhara@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

@@ -1322,6 +1322,7 @@ struct pqi_ctrl_info {
 	bool		controller_online;
 	bool		block_requests;
 	bool		scan_blocked;
+	u8		logical_volume_rescan_needed : 1;
 	u8		inbound_spanning_supported : 1;
 	u8		outbound_spanning_supported : 1;
 	u8		pqi_mode_enabled : 1;

drivers/scsi/smartpqi/smartpqi_init.c

@@ -2015,8 +2015,8 @@ static void pqi_dev_info(struct pqi_ctrl_info *ctrl_info,
 
 /* Assumes the SCSI device list lock is held. */
 
-static void pqi_scsi_update_device(struct pqi_scsi_dev *existing_device,
-	struct pqi_scsi_dev *new_device)
+static void pqi_scsi_update_device(struct pqi_ctrl_info *ctrl_info,
+	struct pqi_scsi_dev *existing_device, struct pqi_scsi_dev *new_device)
 {
 	existing_device->device_type = new_device->device_type;
 	existing_device->bus = new_device->bus;
@@ -2026,9 +2026,8 @@ static void pqi_scsi_update_device(struct pqi_scsi_dev *existing_device,
 		existing_device->target_lun_valid = true;
 	}
 
-	if ((existing_device->volume_status == CISS_LV_QUEUED_FOR_EXPANSION ||
-		existing_device->volume_status == CISS_LV_UNDERGOING_EXPANSION) &&
-		new_device->volume_status == CISS_LV_OK)
+	if (pqi_is_logical_device(existing_device) &&
+		ctrl_info->logical_volume_rescan_needed)
 		existing_device->rescan = true;
 
 	/* By definition, the scsi3addr and wwid fields are already the same. */
@@ -2146,7 +2145,7 @@ static void pqi_update_device_list(struct pqi_ctrl_info *ctrl_info,
 			 */
 			device->new_device = false;
 			matching_device->device_gone = false;
-			pqi_scsi_update_device(matching_device, device);
+			pqi_scsi_update_device(ctrl_info, matching_device, device);
 			break;
 		case DEVICE_NOT_FOUND:
 			/*
@@ -2218,8 +2217,8 @@ static void pqi_update_device_list(struct pqi_ctrl_info *ctrl_info,
 	}
 
 	/*
-	 * Notify the SCSI ML if the queue depth of any existing device has
-	 * changed.
+	 * Notify the SML of any existing device changes such as;
+	 * queue depth, device size.
 	 */
 	list_for_each_entry(device, &ctrl_info->scsi_device_list, scsi_device_list_entry) {
 		if (device->sdev && device->queue_depth != device->advertised_queue_depth) {
@@ -2248,6 +2247,9 @@ static void pqi_update_device_list(struct pqi_ctrl_info *ctrl_info,
 			}
 		}
 	}
+
+	ctrl_info->logical_volume_rescan_needed = false;
+
 }
 
 static inline bool pqi_is_supported_device(struct pqi_scsi_dev *device)
@@ -3703,6 +3705,8 @@ static void pqi_event_worker(struct work_struct *work)
 			} else {
 				ack_event = true;
 				rescan_needed = true;
+				if (event->event_type == PQI_EVENT_TYPE_LOGICAL_DEVICE)
+					ctrl_info->logical_volume_rescan_needed = true;
 			}
 			if (ack_event)
 				pqi_acknowledge_event(ctrl_info, event);