lkml.org 
[lkml]   [2021]   [Feb]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 2/2] media: v4l2-async: Safely unregister an non-registered async subdev
Date
From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

Make the V4L2 async framework a bit more robust by allowing to
unregister a non-registered async subdev. Otherwise the
v4l2_async_cleanup() will attempt to delete the async subdev from the
subdev_list with the corresponding list_head not initialized.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
---
drivers/media/v4l2-core/v4l2-async.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
index 37cc0263b273..2347b7ac54d4 100644
--- a/drivers/media/v4l2-core/v4l2-async.c
+++ b/drivers/media/v4l2-core/v4l2-async.c
@@ -750,6 +750,9 @@ EXPORT_SYMBOL(v4l2_async_register_subdev);

void v4l2_async_unregister_subdev(struct v4l2_subdev *sd)
{
+ if (list_is_null(&sd->async_list))
+ return;
+
mutex_lock(&list_lock);

__v4l2_async_notifier_unregister(sd->subdev_notifier);
--
Regards,
Laurent Pinchart

\
 
 \ /
  Last update: 2021-02-26 23:52    [W:0.060 / U:1.552 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site