From: Marek Szyprowski Date: Tue, 14 Oct 2025 10:46:43 +0000 (+0200) Subject: media: samsung: exynos4-is: fix potential ABBA deadlock on init X-Git-Tag: v6.19-rc1~159^2~102 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=17dc8ccd6dd5ffe30aa9b0d36e2af1389344ce2b;p=thirdparty%2Fkernel%2Flinux.git media: samsung: exynos4-is: fix potential ABBA deadlock on init v4l2_device_register_subdev_nodes() must called without taking media_dev->graph_mutex to avoid potential AB-BA deadlock on further subdevice driver initialization. Fixes: fa91f1056f17 ("[media] exynos4-is: Add support for asynchronous subdevices registration") Cc: stable@vger.kernel.org Signed-off-by: Marek Szyprowski Acked-by: Sylwester Nawrocki Signed-off-by: Hans Verkuil --- diff --git a/drivers/media/platform/samsung/exynos4-is/media-dev.c b/drivers/media/platform/samsung/exynos4-is/media-dev.c index d6f7601de597e..bc7087eb761a6 100644 --- a/drivers/media/platform/samsung/exynos4-is/media-dev.c +++ b/drivers/media/platform/samsung/exynos4-is/media-dev.c @@ -1399,12 +1399,14 @@ static int subdev_notifier_complete(struct v4l2_async_notifier *notifier) mutex_lock(&fmd->media_dev.graph_mutex); ret = fimc_md_create_links(fmd); - if (ret < 0) - goto unlock; + if (ret < 0) { + mutex_unlock(&fmd->media_dev.graph_mutex); + return ret; + } - ret = v4l2_device_register_subdev_nodes(&fmd->v4l2_dev); -unlock: mutex_unlock(&fmd->media_dev.graph_mutex); + + ret = v4l2_device_register_subdev_nodes(&fmd->v4l2_dev); if (ret < 0) return ret;