[PATCH 1/2] drm/i915: Replace nondescript 'WARN_ON(!lret)' with a sensible error message

[Ville Syrjälä]

On Mon, Apr 18, 2016 at 01:43:13PM +0200, Maarten Lankhorst wrote:
> Op 18-04-16 om 13:29 schreef ville.syrjala at linux.intel.com:
> > From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> >
> > When a vblank wait times out in intel_atomic_wait_for_vblanks() we just
> > get a cryptic 'WARN_ON(!ret)' backtrace in dmesg. Repace it with
> > something that tells you what actually happened.
> >
> > Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> > Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_display.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > index 4cca155376be..7bdbe4b03591 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -13523,7 +13523,7 @@ static void intel_atomic_wait_for_vblanks(struct drm_device *dev,
> >  					drm_crtc_vblank_count(crtc),
> >  				msecs_to_jiffies(50));
> >  
> > -		WARN_ON(!lret);
> > +		WARN(!lret, "pipe %c vblank wait timed out\n", pipe_name(pipe));
> >  
> >  		drm_crtc_vblank_put(crtc);
> >  	}
> This helper function was never meant to last as long as it did. :(
> 
> Reviewed-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>

Pushed to dinq. Thanks for the review.

-- 
Ville Syrjälä
Intel OTC