linux-kernel - Re: [PATCH v2] drm/arcpgu: Accommodate adv7511 switch to DRM bridge

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Date:   Wed, 19 Oct 2016 09:32:38 +0000
From:   Alexey Brodkin <Alexey.Brodkin@...opsys.com>
To:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "architt@...eaurora.org" <architt@...eaurora.org>,
        "Eugeniy.Paltsev@...opsys.com" <Eugeniy.Paltsev@...opsys.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
Subject: Re: [PATCH v2] drm/arcpgu: Accommodate adv7511 switch to DRM bridge

Hi Archit, all,

On Wed, 2016-10-19 at 14:43 +0530, Archit Taneja wrote:
> 
> On 10/19/2016 01:16 PM, Eugeniy Paltsev wrote:
> > 
> > ARC PGU driver starts crashing on initialization after
> > 'commit e12c2f645557 ("drm/i2c: adv7511: Convert to drm_bridge")'
> > This happenes because in "arcpgu_drm_hdmi_init" function we get pointer
> > of "drm_i2c_encoder_driver" structure, which doesn't exist after
> > adv7511 hdmi encoder interface changed from slave encoder to drm bridge.
> > So, when we call "encoder_init" function from this structure driver
> > crashes.

[snip]

> Looks good now.
> 
> Reviewed-by: Archit Taneja <architt@...eaurora.org>

And IMHO it would be really good to get this one back-ported to 4.8
because it really fixes kernel crash if ARC PGU driver is used.

It might be a bit of a problem because patch itself a little-bit larger
than formal requirement for stable backports but let's see if it gets accepted.

-Alexey