[PATCH 2/3] drm: Warn if vblank state has become inconsistent.

[Michel Dänzer]

On Mit, 2011-04-27 at 16:10 +1000, christopher.halse.rogers at canonical.com wrote:
> From: Christopher James Halse Rogers <christopher.halse.rogers at canonical.com>
> 
> After emitting all the waiting vblank events no-one should hold
> a vblank reference.  Emit a warning if this is not the case.
> 
> Signed-off-by: Christopher James Halse Rogers <christopher.halse.rogers at canonical.com>
> ---
>  drivers/gpu/drm/drm_irq.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> index a1f12cb..72407fa 100644
> --- a/drivers/gpu/drm/drm_irq.c
> +++ b/drivers/gpu/drm/drm_irq.c
> @@ -960,6 +960,7 @@ void drm_vblank_off(struct drm_device *dev, int crtc)
>  						 e->event.sequence);
>  	}
>  
> +	WARN_ON(atomic_read(&dev->vblank_refcount[crtc]) != 0);
>  	spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
>  }
>  EXPORT_SYMBOL(drm_vblank_off);

Reviewed-by: Michel Dänzer <michel at daenzer.net>


-- 
Earthling Michel Dänzer           |                http://www.vmware.com
Libre software enthusiast         |          Debian, X and DRI developer