[PATCH 4.4 29/65] Revert "loop: Fix double mutex_unlock(&loop_ctl_mutex) in loop_control_ioctl()"

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Greg Kroah-Hartman <gre...@linuxfoundation.org>

This reverts commit 9ec298cc874d08020f45791a8396e1593c3278c1 which is
commit 628bd85947091830a8c4872adfd5ed1d515a9cf2 upstream.

It is not needed in the 4.4.y tree at this point in time.

Reported-by: Jan Kara <j...@suse.cz>
Cc: Ming Lei <ming....@redhat.com>
Cc: Jan Kara <j...@suse.cz>
Cc: Tetsuo Handa <penguin-ker...@i-love.sakura.ne.jp>
Cc: Jens Axboe <ax...@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/block/loop.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1936,10 +1936,12 @@ static long loop_control_ioctl(struct fi
                        break;
                if (lo->lo_state != Lo_unbound) {
                        ret = -EBUSY;
+                       mutex_unlock(&loop_ctl_mutex);
                        break;
                }
                if (atomic_read(&lo->lo_refcnt) > 0) {
                        ret = -EBUSY;
+                       mutex_unlock(&loop_ctl_mutex);
                        break;
                }
                lo->lo_disk->private_data = NULL;