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loader/dri3: Use dri3_find_back in loader_dri3_swap_buffers_msc

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If the application hasn't done any drawing since the last call, we
would reuse the same back buffer which was used for the previous swap,
which may not have completed yet. This could result in various issues
such as tearing or application hangs.

In the normal case, the behaviour is unchanged.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97957
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101683
Cc: mesa-stable@lists.freedesktop.org

[Michel Dänzer: Make Thomas' fix from bugzilla actually work as
 intended, write commit log]

(cherry picked from commit 81fb154777)
This commit is contained in:
Thomas Hellstrom 2017-07-04 12:55:15 +09:00 • committed by Emil Velikov
parent a1cb12b0a3
commit fc41e3b74a
1 changed files with 1 additions and 1 deletions
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2
src/loader/loader_dri3_helper.c
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@ -640,7 +640,7 @@ loader_dri3_swap_buffers_msc(struct loader_dri3_drawable *draw,
draw->vtable->flush_drawable(draw, flush_flags);
back = draw->buffers[LOADER_DRI3_BACK_ID(draw->cur_back)];
back = draw->buffers[dri3_find_back(draw)];
if (draw->is_different_gpu && back) {
/* Update the linear buffer before presenting the pixmap */
draw->ext->image->blitImage(dri_context,