linux-kernel - Re: [PATCH 1/2] media: omap3isp fix media_entity

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Date:   Fri, 16 Dec 2016 00:32:01 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Shuah Khan <shuahkh@....samsung.com>
Cc:     sakari.ailus@...ux.intel.com, mchehab@...nel.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] media: omap3isp fix media_entity_cleanup() after media device unregister

Hello Shuah,

Thank you for the patch.

On Thursday 15 Dec 2016 12:40:07 Shuah Khan wrote:
> During unbind isp_remove() media_entity_cleanup() after it unregisters the

I assume you meant "During unbind isp_remove() calls media_entity_cleanup()"

> media_device. Cleanup routine calls media_entity_cleanup() accessing subdev
> entities that have been removed. This will cause problems during unbind.

What problems ? media_entity_cleanup() is a no-op. And regardless of that, you 
shouldn't remove the function call (unless the function is considered 
deprecated, in which case it should be removed completely, and that should be 
discussed beforehand) but move it to the appropriate place.

> Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
> ---
>  drivers/media/platform/omap3isp/ispccdc.c    | 1 -
>  drivers/media/platform/omap3isp/ispccp2.c    | 1 -
>  drivers/media/platform/omap3isp/ispcsi2.c    | 1 -
>  drivers/media/platform/omap3isp/isppreview.c | 1 -
>  drivers/media/platform/omap3isp/ispresizer.c | 1 -
>  drivers/media/platform/omap3isp/ispstat.c    | 1 -
>  drivers/media/platform/omap3isp/ispvideo.c   | 1 -
>  7 files changed, 7 deletions(-)
> 
> diff --git a/drivers/media/platform/omap3isp/ispccdc.c
> b/drivers/media/platform/omap3isp/ispccdc.c index 882310e..6d27e48 100644
> --- a/drivers/media/platform/omap3isp/ispccdc.c
> +++ b/drivers/media/platform/omap3isp/ispccdc.c
> @@ -2726,7 +2726,6 @@ void omap3isp_ccdc_cleanup(struct isp_device *isp)
>  	struct isp_ccdc_device *ccdc = &isp->isp_ccdc;
> 
>  	omap3isp_video_cleanup(&ccdc->video_out);
> -	media_entity_cleanup(&ccdc->subdev.entity);
> 
>  	/* Free LSC requests. As the CCDC is stopped there's no active 
request,
>  	 * so only the pending request and the free queue need to be handled.
> diff --git a/drivers/media/platform/omap3isp/ispccp2.c
> b/drivers/media/platform/omap3isp/ispccp2.c index ca09523..4c1e7f0 100644
> --- a/drivers/media/platform/omap3isp/ispccp2.c
> +++ b/drivers/media/platform/omap3isp/ispccp2.c
> @@ -1162,5 +1162,4 @@ void omap3isp_ccp2_cleanup(struct isp_device *isp)
>  	struct isp_ccp2_device *ccp2 = &isp->isp_ccp2;
> 
>  	omap3isp_video_cleanup(&ccp2->video_in);
> -	media_entity_cleanup(&ccp2->subdev.entity);
>  }
> diff --git a/drivers/media/platform/omap3isp/ispcsi2.c
> b/drivers/media/platform/omap3isp/ispcsi2.c index f75a1be..840756e 100644
> --- a/drivers/media/platform/omap3isp/ispcsi2.c
> +++ b/drivers/media/platform/omap3isp/ispcsi2.c
> @@ -1318,5 +1318,4 @@ void omap3isp_csi2_cleanup(struct isp_device *isp)
>  	struct isp_csi2_device *csi2a = &isp->isp_csi2a;
> 
>  	omap3isp_video_cleanup(&csi2a->video_out);
> -	media_entity_cleanup(&csi2a->subdev.entity);
>  }
> diff --git a/drivers/media/platform/omap3isp/isppreview.c
> b/drivers/media/platform/omap3isp/isppreview.c index ac30a0f..a179dac
> 100644
> --- a/drivers/media/platform/omap3isp/isppreview.c
> +++ b/drivers/media/platform/omap3isp/isppreview.c
> @@ -2348,5 +2348,4 @@ void omap3isp_preview_cleanup(struct isp_device *isp)
>  	v4l2_ctrl_handler_free(&prev->ctrls);
>  	omap3isp_video_cleanup(&prev->video_in);
>  	omap3isp_video_cleanup(&prev->video_out);
> -	media_entity_cleanup(&prev->subdev.entity);
>  }
> diff --git a/drivers/media/platform/omap3isp/ispresizer.c
> b/drivers/media/platform/omap3isp/ispresizer.c index 0b6a875..d22a54a
> 100644
> --- a/drivers/media/platform/omap3isp/ispresizer.c
> +++ b/drivers/media/platform/omap3isp/ispresizer.c
> @@ -1791,5 +1791,4 @@ void omap3isp_resizer_cleanup(struct isp_device *isp)
> 
>  	omap3isp_video_cleanup(&res->video_in);
>  	omap3isp_video_cleanup(&res->video_out);
> -	media_entity_cleanup(&res->subdev.entity);
>  }
> diff --git a/drivers/media/platform/omap3isp/ispstat.c
> b/drivers/media/platform/omap3isp/ispstat.c index 1b9217d..47b8e43 100644
> --- a/drivers/media/platform/omap3isp/ispstat.c
> +++ b/drivers/media/platform/omap3isp/ispstat.c
> @@ -1055,7 +1055,6 @@ int omap3isp_stat_init(struct ispstat *stat, const
> char *name,
> 
>  void omap3isp_stat_cleanup(struct ispstat *stat)
>  {
> -	media_entity_cleanup(&stat->subdev.entity);
>  	mutex_destroy(&stat->ioctl_lock);
>  	isp_stat_bufs_free(stat);
>  	kfree(stat->buf);
> diff --git a/drivers/media/platform/omap3isp/ispvideo.c
> b/drivers/media/platform/omap3isp/ispvideo.c index 7354469..6914035 100644
> --- a/drivers/media/platform/omap3isp/ispvideo.c
> +++ b/drivers/media/platform/omap3isp/ispvideo.c
> @@ -1470,7 +1470,6 @@ int omap3isp_video_init(struct isp_video *video, const
> char *name)
> 
>  void omap3isp_video_cleanup(struct isp_video *video)
>  {
> -	media_entity_cleanup(&video->video.entity);
>  	mutex_destroy(&video->queue_lock);
>  	mutex_destroy(&video->stream_lock);
>  	mutex_destroy(&video->mutex);

-- 
Regards,

Laurent Pinchart