linux-kernel - Re: [PATCH 09/31] media: v4l2-core add v4l_vb2q_enable_media

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 28 Jan 2016 13:29:37 -0200
From:	Mauro Carvalho Chehab <mchehab@....samsung.com>
To:	Shuah Khan <shuahkh@....samsung.com>
Cc:	tiwai@...e.com, clemens@...isch.de, hans.verkuil@...co.com,
	laurent.pinchart@...asonboard.com, sakari.ailus@...ux.intel.com,
	javier@....samsung.com, pawel@...iak.com, m.szyprowski@...sung.com,
	kyungmin.park@...sung.com, perex@...ex.cz, arnd@...db.de,
	dan.carpenter@...cle.com, tvboxspy@...il.com, crope@....fi,
	ruchandani.tina@...il.com, corbet@....net, chehabrafael@...il.com,
	k.kozlowski@...sung.com, stefanr@...6.in-berlin.de,
	inki.dae@...sung.com, jh1009.sung@...sung.com,
	elfring@...rs.sourceforge.net, prabhakar.csengg@...il.com,
	sw0312.kim@...sung.com, p.zabel@...gutronix.de,
	ricardo.ribalda@...il.com, labbott@...oraproject.org,
	pierre-louis.bossart@...ux.intel.com, ricard.wanderlof@...s.com,
	julian@...st.de, takamichiho@...il.com, dominic.sacre@....de,
	misterpib@...il.com, daniel@...que.org, gtmkramer@...all.nl,
	normalperson@...t.net, joe@...po.co.uk, linuxbugs@...tgam.net,
	johan@...ud.se, linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org, linux-api@...r.kernel.org,
	alsa-devel@...a-project.org
Subject: Re: [PATCH 09/31] media: v4l2-core add
 v4l_vb2q_enable_media_tuner() helper

Em Wed,  6 Jan 2016 13:26:58 -0700
Shuah Khan <shuahkh@....samsung.com> escreveu:

> Add a new v4l_vb2q_enable_media_tuner() wrapper function
> to be called from v4l2-core to enable the media tuner with
> videobuf2 queue, when the calling frunction has the videobuf2
> queue and doesn't have the struct video_device associated with
> the queue handy as in the case of vb2_core_streamon(). This
> function simply calls v4l_enable_media_tuner() passing in the
> pointer to struct video_device.
> 
> Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
> ---
>  drivers/media/v4l2-core/v4l2-dev.c | 21 +++++++++++++++++++++
>  include/media/v4l2-dev.h           |  1 +
>  2 files changed, 22 insertions(+)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
> index f06da6e..9ef675a 100644
> --- a/drivers/media/v4l2-core/v4l2-dev.c
> +++ b/drivers/media/v4l2-core/v4l2-dev.c
> @@ -30,6 +30,7 @@
>  #include <media/v4l2-common.h>
>  #include <media/v4l2-device.h>
>  #include <media/v4l2-ioctl.h>
> +#include <media/videobuf2-core.h>
>  
>  #define VIDEO_NUM_DEVICES	256
>  #define VIDEO_NAME              "video4linux"
> @@ -261,6 +262,26 @@ void v4l_disable_media_tuner(struct video_device *vdev)
>  }
>  EXPORT_SYMBOL_GPL(v4l_disable_media_tuner);
>  
> +/**
> + * v4l_vb2q_enable_media_tuner - Wrapper for v4l_enable_media_tuner()
> + * @q:         videobuf2 queue
> + *
> + * This function is intended to be called from v4l2-core
> + * to enable the media tuner with videobuf2 queue, when
> + * the calling frunction has the videobuf2 queue and doesn't

	typo: function

> + * have the struct video_device associated with the
> + * queue handy as in the case of vb2_core_streamon(). This
> + * function simply calls v4l_enable_media_tuner() passing
> + * in the pointer to struct video_device.

The hole description seems confusing. I'm not seeing the light
about why this is needed.

> + */
> +int v4l_vb2q_enable_media_tuner(struct vb2_queue *q)
> +{
> +	struct v4l2_fh *fh = q->owner;
> +
> +	return v4l_enable_media_tuner(fh->vdev);
> +}
> +EXPORT_SYMBOL_GPL(v4l_vb2q_enable_media_tuner);
> +
>  /* Priority handling */
>  
>  static inline bool prio_is_valid(enum v4l2_priority prio)
> diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
> index 68999a3..1948097 100644
> --- a/include/media/v4l2-dev.h
> +++ b/include/media/v4l2-dev.h
> @@ -179,6 +179,7 @@ struct video_device * __must_check video_device_alloc(void);
>  
>  int v4l_enable_media_tuner(struct video_device *vdev);
>  void v4l_disable_media_tuner(struct video_device *vdev);
> +int v4l_vb2q_enable_media_tuner(struct vb2_queue *q);

Documentation?

>  
>  /* this release function frees the vdev pointer */
>  void video_device_release(struct video_device *vdev);