linux-kernel - Re: [PATCH] media: Clarify the meaning of file descriptors in VIDIOC

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Message-ID: <20190620084457.irkmv4wy7pbvlj5r@kekkonen.localdomain>
Date:   Thu, 20 Jun 2019 11:44:58 +0300
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Tomasz Figa <tfiga@...omium.org>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Alexandre Courbot <acourbot@...omium.org>,
        Hirokazu Honda <hiroh@...omium.org>
Subject: Re: [PATCH] media: Clarify the meaning of file descriptors in
 VIDIOC_DQBUF

On Wed, Jun 12, 2019 at 06:36:48PM +0900, Tomasz Figa wrote:
> When the application calls VIDIOC_DQBUF with the DMABUF memory type, the
> v4l2_buffer structure (or v4l2_plane structures) are filled with DMA-buf
> file descriptors. However, the current documentation does not explain
> whether those are new file descriptors referring to the same DMA-bufs or
> just the same integers as passed to VIDIOC_QBUF back in time. Clarify
> the documentation that it's the latter.
> 
> Signed-off-by: Tomasz Figa <tfiga@...omium.org>

Acked-by: Sakari Ailus <sakari.ailus@...ux.intel.com>

-- 
Sakari Ailus
sakari.ailus@...ux.intel.com