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 --- drivers/gpu/drm/msm/mdp/mdp5/mdp5_smp.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_smp.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_smp.c index bf55188..1f795af89 100644 --- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_smp.c +++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_smp.c @@ -119,9 +119,10 @@ static int smp_request_block(struct mdp5_smp *smp,
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); + }
avail = cnt - bitmap_weight(smp->state, cnt); if (nblks > avail) {