Am 27.04.2018 um 08:17 schrieb Daniel Vetter:
When this was introduced in
commit a519435a96597d8cd96123246fea4ae5a6c90b02
Author: Christian König <christian.koenig@xxxxxxx>
Date: Tue Oct 20 16:34:16 2015 +0200
dma-buf/fence: add fence_wait_any_timeout function v2
there was a restriction added that this only works if the dma-fence
uses the dma_fence_default_wait hook. Which works for amdgpu, which is
the only caller. Well, until you share some buffers with e.g. i915,
then you get an -EINVAL.
But there's really no reason for this, because all drivers must
support callbacks. The special ->wait hook is only as an optimization;
if the driver needs to create a worker thread for an active callback,
then it can avoid to do that if it knows that there's a process
context available already. So ->wait is just an optimization, just
using the logic in dma_fence_default_wait() should work for all
drivers.
Let's remove this restriction.
Mhm, that was intentional introduced because for radeon that is not only
an optimization, but mandatory for correct operation.
On the other hand radeon isn't using this function, so it should be fine
as long as the Intel driver can live with it.
Christian.
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Cc: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
Cc: Gustavo Padovan <gustavo@xxxxxxxxxxx>
Cc: linux-media@xxxxxxxxxxxxxxx
Cc: linaro-mm-sig@xxxxxxxxxxxxxxxx
Cc: Christian König <christian.koenig@xxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
---
drivers/dma-buf/dma-fence.c | 5 -----
1 file changed, 5 deletions(-)
diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c
index 7b5b40d6b70e..59049375bd19 100644
--- a/drivers/dma-buf/dma-fence.c
+++ b/drivers/dma-buf/dma-fence.c
@@ -503,11 +503,6 @@ dma_fence_wait_any_timeout(struct dma_fence **fences, uint32_t count,
for (i = 0; i < count; ++i) {
struct dma_fence *fence = fences[i];
- if (fence->ops->wait != dma_fence_default_wait) {
- ret = -EINVAL;
- goto fence_rm_cb;
- }
-
cb[i].task = current;
if (dma_fence_add_callback(fence, &cb[i].base,
dma_fence_default_wait_cb)) {
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