commit 4d5498b2b400ee4781b25fa9fa219eadf11c1ef5
Author: Phillip Susi <psusi@cfl.rr.com>
Date:   Mon Jun 27 18:55:00 2011 -0400

    Fixed loopback device to emit uevent on auto release
    
    The loopback driver failed to emit the change uevent
    when auto releasing the device.  Fixed lo_release()
    to pass the bdev to loop_clr_fd() so it can emit
    the event.

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index dbf31ec..ba915ce 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1522,7 +1522,7 @@ static int lo_release(struct gendisk *disk, fmode_t mode)
 		 * In autoclear mode, stop the loop thread
 		 * and remove configuration after last close.
 		 */
-		err = loop_clr_fd(lo, NULL);
+		err = loop_clr_fd(lo, lo->lo_device);
 		if (!err)
 			goto out_unlocked;
 	} else {