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DRI2: handle swapsPending better

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Avoid a potential swapsPending underflow by incrementing it before
ScheduleSwap, which may complete it immediately.  And be sure to
decrement it again in case the schedule failed.

Reported-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Reviewed-by: Mario Kleiner <mario.kleiner@tuebingen.mpg.de>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Jesse Barnes 2010-03-08 12:41:25 -08:00
parent 0294ff2a5c
commit b00d435ddf
1 changed files with 2 additions and 1 deletions
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3
hw/xfree86/dri2/dri2.c
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@ -654,15 +654,16 @@ DRI2SwapBuffers(ClientPtr client, DrawablePtr pDraw, CARD64 target_msc,
*swap_target = target_msc;
}
pPriv->swapsPending++;
ret = (*ds->ScheduleSwap)(client, pDraw, pDestBuffer, pSrcBuffer,
swap_target, divisor, remainder, func, data);
if (!ret) {
pPriv->swapsPending--; /* didn't schedule */
xf86DrvMsg(pScreen->myNum, X_ERROR,
"[DRI2] %s: driver failed to schedule swap\n", __func__);
return BadDrawable;
}
pPriv->swapsPending++;
pPriv->last_swap_target = *swap_target;
/* According to spec, return expected swapbuffers count SBC after this swap