drm-vblank: Always return true vblank count of scheduled vblank event.

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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>

...

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Mario Kleiner 2010-12-10 16:00:19 +01:00 • committed by Dave Airlie

parent 3ce0516890

commit 000fa7cf46

1 changed files with 3 additions and 0 deletions

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drivers/gpu/drm/drm_irq.c

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