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dma-buf: fix reservation_object_wait_timeout_rcu to wait correctly v2 

With hardware resets in mind it is possible that all shared fences are
signaled, but the exlusive isn't. Fix waiting for everything in this situation.

v2: make sure we always wait for the exclusive fence

Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1502384509-10465-3-git-send-email-alexander.deucher@amd.com
This commit is contained in:
Christian König 2017-08-10 13:01:49 -04:00 committed by Alex Deucher
parent 7faf952a30
commit b88fa004e8
1 changed files with 15 additions and 18 deletions
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33
drivers/dma-buf/reservation.c
View File

@ -431,12 +431,25 @@ long reservation_object_wait_timeout_rcu(struct reservation_object *obj,
long ret = timeout ? timeout : 1;
retry:
fence = NULL;
shared_count = 0;
seq = read_seqcount_begin(&obj->seq);
rcu_read_lock();
if (wait_all) {
fence = rcu_dereference(obj->fence_excl);
if (fence && !test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) {
if (!dma_fence_get_rcu(fence))
goto unlock_retry;
if (dma_fence_is_signaled(fence)) {
dma_fence_put(fence);
fence = NULL;
}
} else {
fence = NULL;
}
if (!fence && wait_all) {
struct reservation_object_list *fobj =
rcu_dereference(obj->fence);
@ -463,22 +476,6 @@ retry:
}
}
if (!shared_count) {
struct dma_fence *fence_excl = rcu_dereference(obj->fence_excl);
if (fence_excl &&
!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
&fence_excl->flags)) {
if (!dma_fence_get_rcu(fence_excl))
goto unlock_retry;
if (dma_fence_is_signaled(fence_excl))
dma_fence_put(fence_excl);
else
fence = fence_excl;
}
}
rcu_read_unlock();
if (fence) {
if (read_seqcount_retry(&obj->seq, seq)) {