scsi: core: Improve type safety of scsi_rescan_device()

Most callers of scsi_rescan_device() have the scsi_device pointer readily
available. Pass a struct scsi_device pointer to scsi_rescan_device()
instead of a struct device pointer. This change prevents that a pointer to
another struct device would be passed accidentally to scsi_rescan_device().

Remove the scsi_rescan_device() declaration from the scsi_priv.h header
file since it duplicates the declaration in <scsi/scsi_host.h>.

Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Cc: Mike Christie <michael.christie@oracle.com>
Cc: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20230822153043.4046244-1-bvanassche@acm.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Author: bvanassche

drivers/ata/libata-scsi.c

@@ -4884,7 +4884,7 @@ void ata_scsi_dev_rescan(struct work_struct *work)
 			}
 
 			spin_unlock_irqrestore(ap->lock, flags);
-			scsi_rescan_device(&(sdev->sdev_gendev));
+			scsi_rescan_device(sdev);
 			scsi_device_put(sdev);
 			spin_lock_irqsave(ap->lock, flags);
 		}

drivers/scsi/aacraid/commsup.c

@@ -1451,7 +1451,7 @@ static void aac_handle_aif(struct aac_dev * dev, struct fib * fibptr)
 #endif
 				break;
 			}
-			scsi_rescan_device(&device->sdev_gendev);
+			scsi_rescan_device(device);
 			break;
 
 		default:

drivers/scsi/mvumi.c

@@ -1500,7 +1500,7 @@ static void mvumi_rescan_devices(struct mvumi_hba *mhba, int id)
 
 	sdev = scsi_device_lookup(mhba->shost, 0, id, 0);
 	if (sdev) {
-		scsi_rescan_device(&sdev->sdev_gendev);
+		scsi_rescan_device(sdev);
 		scsi_device_put(sdev);
 	}
 }

drivers/scsi/scsi_lib.c

@@ -2458,7 +2458,7 @@ static void scsi_evt_emit(struct scsi_device *sdev, struct scsi_event *evt)
 		envp[idx++] = "SDEV_MEDIA_CHANGE=1";
 		break;
 	case SDEV_EVT_INQUIRY_CHANGE_REPORTED:
-		scsi_rescan_device(&sdev->sdev_gendev);
+		scsi_rescan_device(sdev);
 		envp[idx++] = "SDEV_UA=INQUIRY_DATA_HAS_CHANGED";
 		break;
 	case SDEV_EVT_CAPACITY_CHANGE_REPORTED:

drivers/scsi/scsi_priv.h

@@ -137,7 +137,6 @@ extern int scsi_complete_async_scans(void);
 extern int scsi_scan_host_selected(struct Scsi_Host *, unsigned int,
 				   unsigned int, u64, enum scsi_scan_mode);
 extern void scsi_forget_host(struct Scsi_Host *);
-extern void scsi_rescan_device(struct device *);
 
 /* scsi_sysctl.c */
 #ifdef CONFIG_SYSCTL

drivers/scsi/scsi_scan.c

@@ -1619,9 +1619,9 @@ int scsi_add_device(struct Scsi_Host *host, uint channel,
 }
 EXPORT_SYMBOL(scsi_add_device);
 
-void scsi_rescan_device(struct device *dev)
+void scsi_rescan_device(struct scsi_device *sdev)
 {
-	struct scsi_device *sdev = to_scsi_device(dev);
+	struct device *dev = &sdev->sdev_gendev;
 
 	device_lock(dev);
 

drivers/scsi/scsi_sysfs.c

@@ -747,7 +747,7 @@ static ssize_t
 store_rescan_field (struct device *dev, struct device_attribute *attr,
 		    const char *buf, size_t count)
 {
-	scsi_rescan_device(dev);
+	scsi_rescan_device(to_scsi_device(dev));
 	return count;
 }
 static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
@@ -840,7 +840,7 @@ store_state_field(struct device *dev, struct device_attribute *attr,
 		 * waiting for pending I/O to finish.
 		 */
 		blk_mq_run_hw_queues(sdev->request_queue, true);
-		scsi_rescan_device(dev);
+		scsi_rescan_device(sdev);
 	}
 
 	return ret == 0 ? count : -EINVAL;

drivers/scsi/smartpqi/smartpqi_init.c

@@ -2257,7 +2257,7 @@ static void pqi_update_device_list(struct pqi_ctrl_info *ctrl_info,
 			device->advertised_queue_depth = device->queue_depth;
 			scsi_change_queue_depth(device->sdev, device->advertised_queue_depth);
 			if (device->rescan) {
-				scsi_rescan_device(&device->sdev->sdev_gendev);
+				scsi_rescan_device(device->sdev);
 				device->rescan = false;
 			}
 		}

drivers/scsi/storvsc_drv.c

@@ -470,7 +470,7 @@ static void storvsc_device_scan(struct work_struct *work)
 	sdev = scsi_device_lookup(wrk->host, 0, wrk->tgt_id, wrk->lun);
 	if (!sdev)
 		goto done;
-	scsi_rescan_device(&sdev->sdev_gendev);
+	scsi_rescan_device(sdev);
 	scsi_device_put(sdev);
 
 done:

drivers/scsi/virtio_scsi.c

@@ -325,7 +325,7 @@ static void virtscsi_handle_param_change(struct virtio_scsi *vscsi,
 	/* Handle "Parameters changed", "Mode parameters changed", and
 	   "Capacity data has changed".  */
 	if (asc == 0x2a && (ascq == 0x00 || ascq == 0x01 || ascq == 0x09))
-		scsi_rescan_device(&sdev->sdev_gendev);
+		scsi_rescan_device(sdev);
 
 	scsi_device_put(sdev);
 }