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

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Message-ID: <c4f20e7f67f40b13469ea2504f0990ddbce59708.camel@ndufresne.ca>
Date: Tue, 06 Jan 2026 10:56:09 -0500
From: Nicolas Dufresne <nicolas@...fresne.ca>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
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

Hi,

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.

Nicolas

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