Re: [PATCH] dma_fence_array: Fix PENDING_ERROR leak in dma_fence_array_signaled()

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Am 29.11.21 um 13:46 schrieb Thomas Hellström:
On Mon, 2021-11-29 at 13:33 +0100, Christian König wrote:
Am 29.11.21 um 13:23 schrieb Thomas Hellström:
Hi, Christian,

On Mon, 2021-11-29 at 09:21 +0100, Christian König wrote:
Am 29.11.21 um 08:35 schrieb Thomas Hellström:
If a dma_fence_array is reported signaled by a call to
dma_fence_is_signaled(), it may leak the PENDING_ERROR status.

Fix this by clearing the PENDING_ERROR status if we return true
in
dma_fence_array_signaled().

Fixes: 1f70b8b812f3 ("dma-fence: Propagate errors to dma-fence-
array container")
Cc: linaro-mm-sig@xxxxxxxxxxxxxxxx
Cc: Christian König <ckoenig.leichtzumerken@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Thomas Hellström
<thomas.hellstrom@xxxxxxxxxxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
How are the dma-buf / dma-fence patches typically merged? If i915
is
the only fence->error user, could we take this through drm-intel to
avoid a backmerge for upcoming i915 work?
Well that one here looks like a bugfix to me, so either through
drm-misc-fixes ore some i915 -fixes branch sounds fine to me.

If you have any new development based on that a backmerge of the -
fixes
into your -next branch is unavoidable anyway.
Ok, I'll check with Joonas if I can take it through
drm-intel-gt-next, since fixes are cherry-picked from that one. Patch
will then appear in both the -fixes and the -next branch.

Well exactly that's the stuff Daniel told me to avoid :)

But maybe your i915 workflow is somehow better handling that than the AMD workflow.

Christian.


Thanks,
/Thomas


Regards,
Christian.

/Thomas


---
    drivers/dma-buf/dma-fence-array.c | 6 +++++-
    1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/dma-buf/dma-fence-array.c b/drivers/dma-
buf/dma-fence-array.c
index d3fbd950be94..3e07f961e2f3 100644
--- a/drivers/dma-buf/dma-fence-array.c
+++ b/drivers/dma-buf/dma-fence-array.c
@@ -104,7 +104,11 @@ static bool
dma_fence_array_signaled(struct
dma_fence *fence)
    {
          struct dma_fence_array *array =
to_dma_fence_array(fence);
-       return atomic_read(&array->num_pending) <= 0;
+       if (atomic_read(&array->num_pending) > 0)
+               return false;
+
+       dma_fence_array_clear_pending_error(array);
+       return true;
    }
   static void dma_fence_array_release(struct dma_fence *fence)





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