linux-kernel - [PATCH 4/5] test_kmod: fix the lock in register_test_dev

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Message-Id: <20170802211450.27928-5-mcgrof@kernel.org>
Date:   Wed,  2 Aug 2017 14:14:49 -0700
From:   "Luis R. Rodriguez" <mcgrof@...nel.org>
To:     akpm@...ux-foundation.org
Cc:     dmitry.torokhov@...il.com, keescook@...omium.org, jeyu@...hat.com,
        rusty@...tcorp.com.au, mmarek@...e.com, pmladek@...e.com,
        mbenes@...e.cz, jpoimboe@...hat.com, ebiederm@...ssion.com,
        shuah@...nel.org, dan.carpenter@...cle.com,
        colin.king@...onical.com, dcb314@...mail.com,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Luis R . Rodriguez" <mcgrof@...nel.org>
Subject: [PATCH 4/5] test_kmod: fix the lock in register_test_dev_kmod()

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

We accidentally just drop the lock twice instead of taking it and then
releasing it. This isn't a big issue unless you are adding more than
one device to test on, and the kmod.sh doesn't do that yet, however
this obviously is the correct thing to do.

Fixes: 39258f448d71 ("kmod: add test driver to stress test the module loader")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
[mcgrof: massaged subject, explain what happens]
Signed-off-by: Luis R. Rodriguez <mcgrof@...nel.org>
---
 lib/test_kmod.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/test_kmod.c b/lib/test_kmod.c
index 8fc0a7a19c83..1bc06bbfc97a 100644
--- a/lib/test_kmod.c
+++ b/lib/test_kmod.c
@@ -1146,7 +1146,7 @@ static struct kmod_test_device *register_test_dev_kmod(void)
 	struct kmod_test_device *test_dev = NULL;
 	int ret;
 
-	mutex_unlock(&reg_dev_mutex);
+	mutex_lock(&reg_dev_mutex);
 
 	/* int should suffice for number of devices, test for wrap */
 	if (unlikely(num_test_devs + 1) < 0) {
-- 
2.11.0