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

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Message-ID: <20140902081612.GH4193@intel.com>
Date:	Tue, 2 Sep 2014 11:16:12 +0300
From:	Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:	Jani Nikula <jani.nikula@...ux.intel.com>
Cc:	Chris Wilson <chris@...is-wilson.co.uk>,
	intel-gfx@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	linux-kernel@...r.kernel.org, Tibor Billes <tbilles@....com>
Subject: Re: [PATCH v2] drm/i915: Fix lock dropping in intel_tv_detect()

On Tue, Sep 02, 2014 at 10:41:05AM +0300, Jani Nikula wrote:
> On Mon, 01 Sep 2014, Chris Wilson <chris@...is-wilson.co.uk> wrote:
> > 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. :)
> 
> Ville?

I don't know anymore. Just kill the WARN_ON() if it makes things
confusing?

-- 
Ville Syrjälä
Intel OTC
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