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SubjectRe: [PATCH] media: cedrus: Fix initialization order
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Date
Hi,

Le dimanche 07 avril 2019 à 20:47 +0200, Jernej Skrabec a écrit :
> Currently, MEDIA_IOC_G_TOPOLOGY ioctl on cedrus fails due to incorrect
> initialization order. Fix that by moving video_register_device() before
> v4l2_m2m_register_media_controller() and while at it, fix error path.
>
> Reported-by: Jonas Karlman <jonas@kwiboo.se>
> Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>

Thanks for the fix, good catch!

Acked-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>

Cheers,

Paul

> ---
> drivers/staging/media/sunxi/cedrus/cedrus.c | 24 ++++++++++-----------
> 1 file changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/staging/media/sunxi/cedrus/cedrus.c b/drivers/staging/media/sunxi/cedrus/cedrus.c
> index b98add3cdedd..d0429c0e6b6b 100644
> --- a/drivers/staging/media/sunxi/cedrus/cedrus.c
> +++ b/drivers/staging/media/sunxi/cedrus/cedrus.c
> @@ -300,7 +300,7 @@ static int cedrus_probe(struct platform_device *pdev)
> "Failed to initialize V4L2 M2M device\n");
> ret = PTR_ERR(dev->m2m_dev);
>
> - goto err_video;
> + goto err_v4l2;
> }
>
> dev->mdev.dev = &pdev->dev;
> @@ -310,23 +310,23 @@ static int cedrus_probe(struct platform_device *pdev)
> dev->mdev.ops = &cedrus_m2m_media_ops;
> dev->v4l2_dev.mdev = &dev->mdev;
>
> - ret = v4l2_m2m_register_media_controller(dev->m2m_dev, vfd,
> - MEDIA_ENT_F_PROC_VIDEO_DECODER);
> - if (ret) {
> - v4l2_err(&dev->v4l2_dev,
> - "Failed to initialize V4L2 M2M media controller\n");
> - goto err_m2m;
> - }
> -
> ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0);
> if (ret) {
> v4l2_err(&dev->v4l2_dev, "Failed to register video device\n");
> - goto err_v4l2;
> + goto err_m2m;
> }
>
> v4l2_info(&dev->v4l2_dev,
> "Device registered as /dev/video%d\n", vfd->num);
>
> + ret = v4l2_m2m_register_media_controller(dev->m2m_dev, vfd,
> + MEDIA_ENT_F_PROC_VIDEO_DECODER);
> + if (ret) {
> + v4l2_err(&dev->v4l2_dev,
> + "Failed to initialize V4L2 M2M media controller\n");
> + goto err_video;
> + }
> +
> ret = media_device_register(&dev->mdev);
> if (ret) {
> v4l2_err(&dev->v4l2_dev, "Failed to register media device\n");
> @@ -339,10 +339,10 @@ static int cedrus_probe(struct platform_device *pdev)
>
> err_m2m_mc:
> v4l2_m2m_unregister_media_controller(dev->m2m_dev);
> -err_m2m:
> - v4l2_m2m_release(dev->m2m_dev);
> err_video:
> video_unregister_device(&dev->vfd);
> +err_m2m:
> + v4l2_m2m_release(dev->m2m_dev);
> err_v4l2:
> v4l2_device_unregister(&dev->v4l2_dev);
>
--
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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