[PATCH] DRI2/xserver: Don't hang in glXSwapBuffers if drawable moves between crtc's

[Mario Kleiner]

Hi

This patch fixes a hang in glXSwapBuffers if a user moves
a drawable from a fast running crtc, e.g., 60 Hz to a slower
running crtc, e.g., 50 Hz, when using the new DRI2 sync & swap bits.

It should fix Bugzilla bug #28383.

<https://bugs.freedesktop.org/show_bug.cgi?id=28383>

I've tested this on a R600 against master. I assume the poster
of that bug report will test it as well. He has tested a previous
version of the patch.

Jesse could you review it? Would be good if this could make
it into master and 1.8.2 as well.

thanks,
-mario