linux-kernel - Re: [GIT PULL for v4.5-rc1] media controller next gen patch series

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Date:	Tue, 19 Jan 2016 10:53:05 -0300
From:	Javier Martinez Canillas <javier@....samsung.com>
To:	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	Linux Media Mailing List <linux-media@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-renesas-soc@...r.kernel.org
Subject: Re: [GIT PULL for v4.5-rc1] media controller next gen patch series

Hello,

On 01/19/2016 07:20 AM, Mauro Carvalho Chehab wrote:
> Em Tue, 19 Jan 2016 11:02:30 +0100
> Geert Uytterhoeven <geert@...ux-m68k.org> escreveu:
>
>> Hi Mauro,
>>
>> On Tue, Jan 12, 2016 at 11:43 AM, Mauro Carvalho Chehab
>> <mchehab@....samsung.com> wrote:
>>> That's the second part of the media patches. It contains the media controller
>>> next generation patches, with is the result of one year of discussions and
>>> development. It also contains patches to enable media controller support
>>> at the DVB subsystem.
>>>
>>> The goal is to improve the media controller to allow proper support for
>>> other types of Video4Linux devices (radio and TV ones) and to extend the
>>> media controller functionality to allow it to be used by other subsystems
>>> like DVB, ALSA and IIO.
>>>
>>> In order to use the new functionality, a new ioctl is needed
>>> (MEDIA_IOC_G_TOPOLOGY). As we're still discussing how to pack the struct
>>> fields of this ioctl in order to avoid compat32 issues, I decided to add
>>> a patch at the end of this series commenting out the new ioctl, in order
>>> to postpone the addition of the new ioctl to the next Kernel version (4.6).
>>> With that, no userspace visible changes should happen at the media
>>> controller API, as the existing ioctls are untouched. Yet, it helps
>>> DVB, ALSA and IIO developers to develop and test the patches adding media
>>> controller support there, as the core will contain all required internal
>>> changes to allow adding support for devices that belong to those
>>> subsystems.
>>>
>>> Regards,
>>> Mauro
>>>
>>> The following changes since commit 768acf46e1320d6c41ed1b7c4952bab41c1cde79:
>>>
>>>    [media] rc: sunxi-cir: Initialize the spinlock properly (2015-12-23 15:51:40 -0200)
>>>
>>> are available in the git repository at:
>>>
>>>    git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media tags/media/v4.5-2
>>>
>>> for you to fetch changes up to be0270ec89e6b9b49de7e533dd1f3a89ad34d205:
>>>
>>>    [media] Postpone the addition of MEDIA_IOC_G_TOPOLOGY (2016-01-11 12:35:17 -0200)
>>
>> After merging this into mainline, I get the BUG_ON() and crash I reported ca.
>> one month ago in "vsp1 BUG_ON() and crash (Re: [PATCH v9 03/12] media:
>> Entities, pads and links)" ( https://lkml.org/lkml/2015/12/14/373).
>
> Not sure what happened here, as this was supposed to have fixed already.
> I'll ask Javier to take a look into it and work with you for us to get it
> fixed ASAP.
>

There was a bug in my patch that split the entities registration and links
creation. I posted a fix that was already been tested by Geert:

https://patchwork.linuxtv.org/patch/32675/

> Regards,
> Mauro
>

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America