From: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Date: Fri, 10 Dec 2010 15:00:19 +0000 (+0100)
Subject: drm-vblank: Always return true vblank count of scheduled vblank event.
X-Git-Tag: v2.6.38-rc1~419^2~28
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=000fa7cf46479238f7b9f2d7763e41af5268b16a;p=pandora-kernel.git

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>
---

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