diff options
| author | Mario Kleiner <mario.kleiner@tuebingen.mpg.de> | 2010-12-10 16:00:19 +0100 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2010-12-21 13:25:09 +1000 |
| commit | 000fa7cf46479238f7b9f2d7763e41af5268b16a (patch) | |
| tree | 369187b88e87ffc31b1479dd6eb69a8a942bc755 /drivers/gpu | |
| parent | 3ce05168907c9b1358492a73badb0ff1603fb81d (diff) | |
drm-vblank: Always return true vblank count of scheduled vblank event.
This patch tries to make sure that the vbl.reply.sequence
vblank count for a queued or emitted vblank event always
corresponds to the true vblank count of queueing/emission, so
the ddx can rely on the returned target_msc for consistency
checks and implementation of swap_intervals in glXSwapBuffers().
Without this there is a small race-condition between the
userspace ddx queueing a vblank event and the vblank
counter incrementing before the event gets queued in
the kernel.
Signed-off-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/drm_irq.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c index 4e82d0d3c37..55160d7c38b 100644 --- a/drivers/gpu/drm/drm_irq.c +++ b/drivers/gpu/drm/drm_irq.c @@ -1086,15 +1086,18 @@ static int drm_queue_vblank_event(struct drm_device *dev, int pipe, e->event.sequence = vblwait->request.sequence; if ((seq - vblwait->request.sequence) <= (1 << 23)) { + e->event.sequence = seq; e->event.tv_sec = now.tv_sec; e->event.tv_usec = now.tv_usec; drm_vblank_put(dev, e->pipe); list_add_tail(&e->base.link, &e->base.file_priv->event_list); wake_up_interruptible(&e->base.file_priv->event_wait); + vblwait->reply.sequence = seq; trace_drm_vblank_event_delivered(current->pid, pipe, vblwait->request.sequence); } else { list_add_tail(&e->base.link, &dev->vblank_event_list); + vblwait->reply.sequence = vblwait->request.sequence; } spin_unlock_irqrestore(&dev->event_lock, flags); |