linux-kernel - [PATCH] media: Clear devnode->media_dev holding media_devnode

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Message-Id: <20190402004318.30309-2-shuah@kernel.org>
Date:   Mon,  1 Apr 2019 18:43:18 -0600
From:   Shuah Khan <shuah@...nel.org>
To:     mchehab@...nel.org
Cc:     Shuah Khan <shuah@...nel.org>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] media: Clear devnode->media_dev holding media_devnode_lock

Fix media_devnode_unregister() to clear devnode->media_dev while holding
media_devnode_lock. media_devnode_register()'s cdev_add_error handling
does this correctly.

Signed-off-by: Shuah Khan <shuah@...nel.org>
---
 drivers/media/media-devnode.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/media-devnode.c b/drivers/media/media-devnode.c
index 6b87a721dc49..d92a68a7ad5b 100644
--- a/drivers/media/media-devnode.c
+++ b/drivers/media/media-devnode.c
@@ -290,8 +290,9 @@ void media_devnode_unregister(struct media_devnode *devnode)
 	mutex_lock(&media_devnode_lock);
 	/* Delete the cdev on this minor as well */
 	cdev_device_del(&devnode->cdev, &devnode->dev);
-	mutex_unlock(&media_devnode_lock);
 	devnode->media_dev = NULL;
+	mutex_unlock(&media_devnode_lock);
+
 	put_device(&devnode->dev);
 }
 
-- 
2.17.1