linux-kernel - Re: [PATCH v3] drm: bridge: add DesignWare HDMI I2S audio support

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Message-ID: <20161107145627.GG1041@n2100.armlinux.org.uk>
Date:   Mon, 7 Nov 2016 14:56:28 +0000
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Cc:     Archit Taneja <architt@...eaurora.org>,
        Mark Brown <broonie@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Fabio Estevam <fabio.estevam@...escale.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Koji Matsuoka <koji.matsuoka.xm@...esas.com>,
        Thierry Reding <treding@...dia.com>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Simon <horms@...ge.net.au>, linux-renesas-soc@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Jose Abreu <joabreu@...opsys.com>
Subject: Re: [PATCH v3] drm: bridge: add DesignWare HDMI I2S audio support

On Mon, Nov 07, 2016 at 03:50:00AM +0000, Kuninori Morimoto wrote:
> 
> Hi Russell
> 
> > > +	platform = platform_device_register_full(&pdevinfo);
> > > +	if (IS_ERR_OR_NULL(platform))
> > > +		return PTR_ERR(platform);
> > 
> > This is wrong.  If platform is NULL, PTR_ERR() will return zero, which
> > will be interpreted as success.  Please, avoid using IS_ERR_OR_NULL(),
> > it leads to exactly this kind of cockup - and it's unnecessary here
> > because platform_device_register_full() does not return NULL.
> 
> Thank you for your feedback.
> Before sending v4 patch, I would like to confirm. Do you meand this ?
> # use IS_ERR() instead of IS_ERR_OR_NULL()
> 
> 	platform = platform_device_register_full(&pdevinfo);
> 	if (IS_ERR(platform))
> 		return PTR_ERR(platform);

Yes, that's exactly correct.

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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