On 2022/03/24 23:13, Jan Kara wrote:

quoted

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index b3170e8cdbe95..e1eb925d3f855 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c

@@ -1244,7 +1244,7 @@ static int loop_clr_fd(struct loop_device *lo)
 	 * <dev>/do something like mkfs/losetup -d <dev> causing the losetup -d
 	 * command to fail with EBUSY.
 	 */
-	if (atomic_read(&lo->lo_refcnt) > 1) {
+	if (disk_openers(lo->lo_disk) > 1) {

This is sometimes "if (0) {" due to not holding disk->open_mutex.

quoted

 		lo->lo_flags |= LO_FLAGS_AUTOCLEAR;
 		mutex_unlock(&lo->lo_mutex);
 		return 0;