linux-kernel - Re: [PATCH 3/3] media: au0828: add VIDEO

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Date:   Thu, 4 Jan 2018 12:31:45 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] media: au0828: add VIDEO_V4L2 dependency

On Thu, Jan 4, 2018 at 11:31 AM, Arnd Bergmann <arnd@...db.de> wrote:
> After the move of videobuf2 into the common directory, selecting the
> au0828 driver with CONFIG_V4L2 disabled started causing a link failure,
> as we now attempt to build videobuf2 but it still requires v4l2:
>
> ERROR: "v4l2_event_pending" [drivers/media/common/videobuf/videobuf2-v4l2.ko] undefined!
> ERROR: "v4l2_fh_release" [drivers/media/common/videobuf/videobuf2-v4l2.ko] undefined!
> ERROR: "video_devdata" [drivers/media/common/videobuf/videobuf2-v4l2.ko] undefined!
> ERROR: "__tracepoint_vb2_buf_done" [drivers/media/common/videobuf/videobuf2-core.ko] undefined!
> ERROR: "__tracepoint_vb2_dqbuf" [drivers/media/common/videobuf/videobuf2-core.ko] undefined!
> ERROR: "v4l_vb2q_enable_media_source" [drivers/media/common/videobuf/videobuf2-core.ko] undefined!
>
> This adds the same dependency in au0828 that the other users of videobuf2
> have.
>
> Fixes: 03fbdb2fc2b8 ("media: move videobuf2 to drivers/media/common")
> Fixes: 05439b1a3693 ("[media] media: au0828 - convert to use videobuf2")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

On a further look, this prevents us from building the RC driver without the V4L2
driver, which was the reason this driver is split. I'll send a v2, but
it needs more
randconfig testing than this version.

        Arnd