linux-kernel - Re: [PATCH 2/3] media: omap3isp: ispvideo: drop driver specific isp_video

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]

Message-ID: <CA+V-a8urdZhD97m4mQu_aYLWW9Kf0PSx=ddhbvteb-HRz2hEEA@mail.gmail.com>
Date:	Tue, 24 Feb 2015 08:04:40 +0000
From:	"Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	LMML <linux-media@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] media: omap3isp: ispvideo: drop driver specific isp_video_fh

Hi Laurent,

Thanks for the review.

On Tue, Feb 24, 2015 at 12:35 AM, Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
> Hi Prabhakar,
>
> Thank you for the patch.
>
> On Monday 23 February 2015 20:19:32 Lad Prabhakar wrote:
>> From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
>>
>> this patch drops driver specific isp_video_fh, as this
>> can be handled by core.
>
> I'm afraid it's not that simple.
>
> The omap3isp driver stores video queues per file handle for a reason. This was
> design to permit creating a high-resolution still image capture queue and
> prepare buffers ahead of time, to avoid the large delay due to cache
> management as prepare time when taking the snapshot.
>
Ah I see the reason.

> Now this use case has been partially solved by VIDIOC_CREATE_BUFS, but we're
> still missing a VIDIOC_DESTROY_BUFS to make it work completely. That needs to
> be solved first.
>
I haven't used the VIDIOC_CREATE_BUFS ioctl so far in any of the apps
so cant comment
much on this.
But isn't that obvious we need VIDIOC_DESTROY_BUFS or is there any backdoor
to destroy them that I am missing ?

Regards,
--Prabhakar Lad

>> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
>> ---
>>  drivers/media/platform/omap3isp/ispvideo.c | 128  ++++++++++---------------
>>  drivers/media/platform/omap3isp/ispvideo.h |  13 +--
>>  2 files changed, 49 insertions(+), 92 deletions(-)
>
> --
> Regards,
>
> Laurent Pinchart
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/