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drm/msm/mdp5: Fix negative SMP block allocation

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In case we request a number of SMP blocks which is lower than
the already reserved blocks, we should not try to allocate a
negative number, but 0 blocks instead.

Signed-off-by: Stephane Viau <sviau@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Stephane Viau 2015-01-16 13:22:14 -05:00 • committed by Rob Clark
commit 2559d19f76
1 changed files with 3 additions and 2 deletions
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5
drivers/gpu/drm/msm/mdp/mdp5/mdp5_smp.c
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@ -119,9 +119,10 @@ static int smp_request_block(struct mdp5_smp *smp,
spin_lock_irqsave(&smp->state_lock, flags); spin_lock_irqsave(&smp->state_lock, flags);
nblks -= reserved; if (reserved) {
if (reserved) nblks = max(0, nblks - reserved);
DBG("%d MMBs allocated (%d reserved)", nblks, reserved); DBG("%d MMBs allocated (%d reserved)", nblks, reserved);
}
avail = cnt - bitmap_weight(smp->state, cnt); avail = cnt - bitmap_weight(smp->state, cnt);
if (nblks > avail) { if (nblks > avail) {