Re: [PATCH 03/12] drm: Make blocking vblank wait return when the vblank interrupts get disabled

On Wed, May 14, 2014 at 08:51:05PM +0200, Daniel Vetter wrote:

From: Ville Syrjälä ville.syrjala@linux.intel.com

If there's a blocking vblank wait in progress while the vblank interrupt gets disabled, the current code will just let the vblank wait time out. Instead make it return immediately when vblank interrupts get disabled.

Can this even happen? drm_wait_vblank() takes a vblank reference earlier and drops it right before returning. But perhaps this will become obvious since from a quick peek some of the subsequent patches seem like they will make it possible to force VBLANK off?

Thierry