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dma-buf: fix reservation_object_wait_timeout_rcu once more v2 

commit 5bffee867d upstream.

We need to set shared_count even if we already have a fence to wait for.

v2: init i to -1 as well

Signed-off-by: Christian König <christian.koenig@amd.com>
Cc: stable@vger.kernel.org
Tested-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180122200003.6665-1-christian.koenig@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Christian König 2018-01-22 21:00:03 +01:00 committed by Greg Kroah-Hartman
parent 40be210c83
commit f25dfc9359
1 changed files with 5 additions and 3 deletions
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8
drivers/dma-buf/reservation.c
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@ -455,13 +455,15 @@ long reservation_object_wait_timeout_rcu(struct reservation_object *obj,
unsigned long timeout)
{
struct dma_fence *fence;
unsigned seq, shared_count, i = 0;
unsigned seq, shared_count;
long ret = timeout ? timeout : 1;
int i;
retry:
shared_count = 0;
seq = read_seqcount_begin(&obj->seq);
rcu_read_lock();
i = -1;
fence = rcu_dereference(obj->fence_excl);
if (fence && !test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) {
@ -477,14 +479,14 @@ retry:
fence = NULL;
}
if (!fence && wait_all) {
if (wait_all) {
struct reservation_object_list *fobj =
rcu_dereference(obj->fence);
if (fobj)
shared_count = fobj->shared_count;
for (i = 0; i < shared_count; ++i) {
for (i = 0; !fence && i < shared_count; ++i) {
struct dma_fence *lfence = rcu_dereference(fobj->shared[i]);
if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,