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drm/i915: wake up all pageflip waiters 

Otherwise it seems like we can get stuck with concurrent waiters.
Right now this /shouldn't/ be a problem, since all pending pageflip
waiters are serialized by the one mode_config.mutex, so there's at
most on waiter. But better paranoid than sorry, since this is tricky
code.

v2: WARN_ON(waitqueue_active) before waiting, as suggested by Chris
Wilson.

Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2012-12-20 21:24:07 +01:00
parent b5cc6c0387
commit 2c10d57116
1 changed files with 5 additions and 1 deletions
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6
drivers/gpu/drm/i915/intel_display.c
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@ -2220,6 +2220,8 @@ intel_finish_fb(struct drm_framebuffer *old_fb)
bool was_interruptible = dev_priv->mm.interruptible;
int ret;
WARN_ON(waitqueue_active(&dev_priv->pending_flip_queue));
wait_event(dev_priv->pending_flip_queue,
atomic_read(&dev_priv->mm.wedged) ||
atomic_read(&obj->pending_flip) == 0);
@ -2887,6 +2889,8 @@ static void intel_crtc_wait_for_pending_flips(struct drm_crtc *crtc)
if (crtc->fb == NULL)
return;
WARN_ON(waitqueue_active(&dev_priv->pending_flip_queue));
wait_event(dev_priv->pending_flip_queue,
!intel_crtc_has_pending_flip(crtc));
@ -6824,7 +6828,7 @@ static void do_intel_finish_page_flip(struct drm_device *dev,
obj = work->old_fb_obj;
wake_up(&dev_priv->pending_flip_queue);
wake_up_all(&dev_priv->pending_flip_queue);
queue_work(dev_priv->wq, &work->work);