linux-kernel - [PATCH 3.16 124/136] block: drbd: remove a stray unlock in __drbd_send

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Date:   Tue, 17 Dec 2019 00:47:38 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Jens Axboe" <axboe@...nel.dk>,
        "Dan Carpenter" <dan.carpenter@...cle.com>
Subject: [PATCH 3.16 124/136] block: drbd: remove a stray unlock in
 __drbd_send_protocol()

3.16.80-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 8e9c523016cf9983b295e4bc659183d1fa6ef8e0 upstream.

There are two callers of this function and they both unlock the mutex so
this ends up being a double unlock.

Fixes: 44ed167da748 ("drbd: rcu_read_lock() and rcu_dereference() for tconn->net_conf")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/block/drbd/drbd_main.c | 1 -
 1 file changed, 1 deletion(-)

--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -786,7 +786,6 @@ int __drbd_send_protocol(struct drbd_con
 
 	if (nc->tentative && connection->agreed_pro_version < 92) {
 		rcu_read_unlock();
-		mutex_unlock(&sock->mutex);
 		drbd_err(connection, "--dry-run is not supported by peer");
 		return -EOPNOTSUPP;
 	}