linux-kernel - Re: [Intel-gfx] [PATCH] drm/i915: Avoid drm_atomic_state_put(NULL) in intel_display

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Date:   Wed, 18 Jan 2017 11:42:03 +0000
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     Ander Conselvan De Oliveira <conselvan2@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        intel-gfx@...ts.freedesktop.org,
        "# v4 . 10-rc1+" <drm-intel-fixes@...ts.freedesktop.org>,
        Stefan Seyfried <stefan.seyfried@...glemail.com>
Subject: Re: [Intel-gfx] [PATCH] drm/i915: Avoid drm_atomic_state_put(NULL)
 in intel_display_resume

On Wed, Jan 18, 2017 at 01:35:33PM +0200, Ander Conselvan De Oliveira wrote:
> On Sun, 2017-01-15 at 12:58 +0000, Chris Wilson wrote:
> > intel_display_resume() may be called without a atomic state to restore,
> > i.e. dev_priv->modeset_reset_restore state is NULL. One such case is
> > following a lid open/close event and the forced modeset in
> > intel_lid_notiy().
> > 
> > Reported-by: Stefan Seyfried <stefan.seyfried@...glemail.com>
> > Fixes: 0853695c3ba4 ("drm: Add reference counting to drm_atomic_state")
> > Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
> > Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> > Cc: Jani Nikula <jani.nikula@...ux.intel.com>
> > Cc: <drm-intel-fixes@...ts.freedesktop.org> # v4.10-rc1+
> > ---
> >  drivers/gpu/drm/i915/intel_display.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_display.c
> > b/drivers/gpu/drm/i915/intel_display.c
> > index 3dc8724df400..260bbe8881e6 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -17024,7 +17024,8 @@ void intel_display_resume(struct drm_device *dev)
> >  
> >  	if (ret)
> >  		DRM_ERROR("Restoring old state failed with %i\n", ret);
> > -	drm_atomic_state_put(state);
> > +	if (state)
> > +		drm_atomic_state_put(state);
> >  }
> >  
> >  void intel_modeset_gem_init(struct drm_device *dev)
> 
> 
> Reviewed-by: Ander Conselvan de Oliveira <conselvan2@...il.com>

Thanks for the review and testing, pushed.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre