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

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Date:	Tue, 19 Jan 2016 11:02:30 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Mauro Carvalho Chehab <mchehab@....samsung.com>
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

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).

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds