linux-kernel - Re: [PATCH 1/4] media: dw100: Implement V4L2 requests support

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Message-ID: <20260106172528.GF26157@pendragon.ideasonboard.com>
Date: Tue, 6 Jan 2026 19:25:28 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Nicolas Dufresne <nicolas@...fresne.ca>
Cc: Stefan Klug <stefan.klug@...asonboard.com>,
	Xavier Roumegue <xavier.roumegue@....nxp.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Clark Williams <clrkwllms@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-rt-devel@...ts.linux.dev,
	Hans Verkuil <hans@...erkuil.nl>
Subject: Re: [PATCH 1/4] media: dw100: Implement V4L2 requests support

On Tue, Jan 06, 2026 at 10:56:09AM -0500, Nicolas Dufresne wrote:
> Le mardi 06 janvier 2026 à 17:45 +0200, Laurent Pinchart a écrit :
> > > I explained it in another thread, it is only called if device_run() is not going
> > > to be called, so only once. vb2 does not have access to the the control handler,
> > > so it can't call the v4l2_ctrl_request_complete() fonction directly.
> > 
> > But the function is called per queue. If a buffer has been queued on
> > both the capture and the output queue for a request, won't the operation
> > be called twice with the same request ?
> 
> Only the OUTPUT queues allow for requests at the moment.

Aahhh that's what I was missing. I thought the request would contain
buffers for both the output and capture queues.

-- 
Regards,

Laurent Pinchart