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drm: vblank cannot be enabled if dev->irq_enabled is false 

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@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170317202030.24410-2-chris@chris-wilson.co.uk
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
This commit is contained in:
Chris Wilson 2017-03-17 20:20:28 +00:00 committed by Ville Syrjälä
parent 43dc7fe2b2
commit 6c06a59703
1 changed files with 3 additions and 4 deletions
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7
drivers/gpu/drm/drm_irq.c
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@ -1639,10 +1639,9 @@ 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) {