diff options
| author |   Christian König <christian.koenig@amd.com> | 2017-08-10 13:01:49 -0400 |
|---|---|---|
| committer |   Alex Deucher <alexander.deucher@amd.com> | 2017-08-14 13:01:25 -0400 |
| commit | b88fa004e8a349eba38a3df7a3ace9dd1730b6e0 (patch) | |
| tree | 5266f2b1ed288dcf70bf5c51bbce37f1d65dc075 /drivers/dma-buf/reservation.c | |
| parent | dma-buf: add reservation_object_copy_fences (v2) (diff) | |
| download | wireguard-linux-b88fa004e8a349eba38a3df7a3ace9dd1730b6e0.tar.xz wireguard-linux-b88fa004e8a349eba38a3df7a3ace9dd1730b6e0.zip | |
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
Diffstat (limited to 'drivers/dma-buf/reservation.c')
| -rw-r--r-- | drivers/dma-buf/reservation.c | 33 |
1 files changed, 15 insertions, 18 deletions
diff --git a/drivers/dma-buf/reservation.c b/drivers/dma-buf/reservation.c index d4881f91c43b..dec3a815455d 100644 --- a/drivers/dma-buf/reservation.c +++ b/drivers/dma-buf/reservation.c @@ -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)) { |