linux-kernel - [PATCH 4.4 29/65] Revert "loop: Fix double mutex_unlock(&loop_ctl_mutex) in loop_control

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Message-Id: <20190204103615.638138495@linuxfoundation.org>
Date:   Mon,  4 Feb 2019 11:36:22 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jan Kara <jack@...e.cz>,
        Ming Lei <ming.lei@...hat.com>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 4.4 29/65] Revert "loop: Fix double mutex_unlock(&loop_ctl_mutex) in loop_control_ioctl()"

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

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

From: Greg Kroah-Hartman <gregkh@...uxfoundation.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 <jack@...e.cz>
Cc: Ming Lei <ming.lei@...hat.com>
Cc: Jan Kara <jack@...e.cz>
Cc: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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;