linux-kernel - Re: [PATCH] media: cedrus: Fix initialization order

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Date:   Mon, 08 Apr 2019 10:18:34 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Jernej Skrabec <jernej.skrabec@...l.net>, maxime.ripard@...tlin.com
Cc:     mchehab@...nel.org, gregkh@...uxfoundation.org, wens@...e.org,
        hverkuil-cisco@...all.nl, linux-media@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Jonas Karlman <jonas@...boo.se>
Subject: Re: [PATCH] media: cedrus: Fix initialization order

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@...boo.se>
> Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>

Thanks for the fix, good catch!

Acked-by: Paul Kocialkowski <paul.kocialkowski@...tlin.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