linux-kernel - Re: [PATCH v3 09/15] media: sunxi: Add support for the A31 MIPI CSI-2 controller

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Message-ID: <X+3KBO6o5HVRh12e@aptenodytes>
Date:   Thu, 31 Dec 2020 13:54:28 +0100
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-sunxi@...glegroups.com, Yong Deng <yong.deng@...ewell.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Jonathan Corbet <corbet@....net>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Helen Koike <helen.koike@...labora.com>,
        Dafna Hirschfeld <dafna.hirschfeld@...labora.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        kevin.lhopital@...mail.com
Subject: Re: [PATCH v3 09/15] media: sunxi: Add support for the A31 MIPI
 CSI-2 controller

Hi,

On Mon 14 Dec 20, 12:39, Maxime Ripard wrote:
> On Fri, Dec 11, 2020 at 04:57:02PM +0100, Paul Kocialkowski wrote:
> > +#define sun6i_mipi_csi2_subdev_video(subdev) \
> > +	container_of(subdev, struct sun6i_mipi_csi2_video, subdev)
> > +
> > +#define sun6i_mipi_csi2_video_dev(video) \
> > +	container_of(video, struct sun6i_mipi_csi2_dev, video)
> 
> Isn't it a bit unsafe?
> 
> The second subdev and video here is not the variable passed in the macro
> but the field in the structure, so any attempt at using those two macros
> with anything but a variable named subdev or video will result in a
> compilation issue?

Yep you're totally right. Will fix in the next revision!

Cheers,

Paul

-- 
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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