[PATCH v2 2/4] drm: vblank cannot be enabled if dev->irq_enabled is false

[Chris Wilson]

Since we cannot enable the vblank if !dev->irq_enabled, we assert that
checking for both !vblank->enabled and !dev->irq_enabled is tautological
and only need the former. The only time it may differ is when racing
with drm_irq_uninstall(), but that will then disable the vblank and
wakeup the waiters.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/drm_irq.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index c47e07c89136..a164cf51d093 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -1647,10 +1647,9 @@ int drm_wait_vblank(struct drm_device *dev, void *data,
 		DRM_DEBUG("waiting on vblank count %u, crtc %u\n",
 			  vblwait->request.sequence, pipe);
 		DRM_WAIT_ON(ret, vblank->queue, 3 * HZ,
-			    (((drm_vblank_count(dev, pipe) -
-			       vblwait->request.sequence) <= (1 << 23)) ||
-			     !READ_ONCE(vblank->enabled) ||
-			     !dev->irq_enabled));
+			    (drm_vblank_count(dev, pipe) -
+			     vblwait->request.sequence) <= (1 << 23) ||
+			    !READ_ONCE(vblank->enabled));
 	}
 
 	if (ret != -EINTR) {
-- 
2.11.0