!465 Revert "scsi: fix iscsi rescan fails to create block"

Merge Pull Request from: @zhangjialin11 
 
Revert "scsi: fix iscsi rescan fails to create block"
This commit has a soft lock problem. 
 
Link:https://gitee.com/openeuler/kernel/pulls/465 

Reviewed-by: Zheng Zengkai <zhengzengkai@huawei.com> 
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com> 

drivers/scsi/scsi_sysfs.c

@@ -1503,13 +1503,6 @@ void scsi_remove_device(struct scsi_device *sdev)
 }
 EXPORT_SYMBOL(scsi_remove_device);
 
-static int scsi_device_try_get(struct scsi_device *sdev)
-{
-	if (!kobject_get_unless_zero(&sdev->sdev_gendev.kobj))
-		return -ENXIO;
-	return 0;
-}
-
 static void __scsi_remove_target(struct scsi_target *starget)
 {
 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
@@ -1528,7 +1521,9 @@ static void __scsi_remove_target(struct scsi_target *starget)
 		if (sdev->channel != starget->channel ||
 		    sdev->id != starget->id)
 			continue;
-		if (scsi_device_try_get(sdev))
+		if (sdev->sdev_state == SDEV_DEL ||
+		    sdev->sdev_state == SDEV_CANCEL ||
+		    !get_device(&sdev->sdev_gendev))
 			continue;
 		spin_unlock_irqrestore(shost->host_lock, flags);
 		scsi_remove_device(sdev);