[SCSI] Skip deleted devices in __scsi_device_lookup_by_target()

__scsi_device_lookup_by_target() will always return
the first sdev with a matching LUN, regardless of
the state. However, when this sdev is in SDEV_DEL
scsi_device_lookup_by_target() will ignore this
device and so any valid device on the list after
the deleted device will never be found.
So we have to modify __scsi_device_lookup_by_target()
to skip any device in SDEV_DEL.

Signed-off-by: Hannes Reinecke <[e-mail]>
Signed-off-by: James Bottomley <[e-mail]>

drivers/scsi/scsi.c

···
  * Description: Looks up the scsi_device with the specified @lun for a given
  * @starget.  The returned scsi_device does not have an additional
  * reference.  You must hold the host's host_lock over this call and
- * any access to the returned scsi_device.
+ * any access to the returned scsi_device. A scsi_device in state
+ * SDEV_DEL is skipped.
  *
  * Note:  The only reason why drivers should use this is because
  * they need to access the device list in irq context.  Otherwise you
···
 	struct scsi_device *sdev;
 
 	list_for_each_entry(sdev, &starget->devices, same_target_siblings) {
+		if (sdev->sdev_state == SDEV_DEL)
+			continue;
 		if (sdev->lun ==lun)
 			return sdev;
 	}