linux-kernel - Re: [PATCH v2] drm/i915: Fix lock dropping in intel_tv

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Message-ID: <20140901104356.GE11648@nuc-i3427.alporthouse.com>
Date:	Mon, 1 Sep 2014 11:43:56 +0100
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:	intel-gfx@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	linux-kernel@...r.kernel.org, Tibor Billes <tbilles@....com>
Subject: Re: [PATCH v2] drm/i915: Fix lock dropping in intel_tv_detect()

On Mon, Sep 01, 2014 at 01:36:37PM +0300, Ville Syrjälä wrote:
> On Mon, Sep 01, 2014 at 11:20:09AM +0100, Chris Wilson wrote:
> > On Mon, Sep 01, 2014 at 01:07:40PM +0300, ville.syrjala@...ux.intel.com wrote:
> > > From: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> > > 
> > > When intel_tv_detect() fails to do load detection it would forget to
> > > drop the locks and clean up the acquire context. Fix it up.
> > > 
> > > This is a regression from:
> > >  commit 208bf9fdcd3575aa4a5d48b3e0295f7cdaf6fc44
> > >  Author: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> > >  Date:   Mon Aug 11 13:15:35 2014 +0300
> > > 
> > >     drm/i915: Fix locking for intel_enable_pipe_a()
> > > 
> > > v2: Make the code more readable (Chris)
> > > 
> > > Cc: Tibor Billes <tbilles@....com>
> > > Signed-off-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> > 
> > Hmm, if we use WARN_ON() you should init type.
> 
> type is always set in the branch that sets status=connected.

Back to thinking about readability and making sure that the WARN_ON
never happens with just a glance. Otherwise, the WARN_ON would be better
as WARN_ON(unsigned)type >= last_tv_type); Or something. Anway, take
your pick and slap my r-b on it. :)
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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