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dma-buf: fix check in dma_resv_add_fence

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It's valid to add the same fence multiple times to a dma-resv object and
we shouldn't need one extra slot for each.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Fixes: a3f7c10a26 ("dma-buf/dma-resv: check if the new fence is really later")
Cc: stable@vger.kernel.org # v5.19+
Link: https://patchwork.freedesktop.org/patch/msgid/20231115093035.1889-1-christian.koenig@amd.com
This commit is contained in:
Christian König 2023-11-14 13:37:09 +01:00
parent 1d5e8f4bf0
commit 95ba893c9f
2 changed files with 16 additions and 1 deletions
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2
drivers/dma-buf/dma-resv.c
View File

@ -301,7 +301,7 @@ void dma_resv_add_fence(struct dma_resv *obj, struct dma_fence *fence,
dma_resv_list_entry(fobj, i, obj, &old, &old_usage);
if ((old->context == fence->context && old_usage >= usage &&
dma_fence_is_later(fence, old)) ||
dma_fence_is_later_or_same(fence, old)) ||
dma_fence_is_signaled(old)) {
dma_resv_list_set(fobj, i, fence, usage);
dma_fence_put(old);

15
include/linux/dma-fence.h
View File

@ -498,6 +498,21 @@ static inline bool dma_fence_is_later(struct dma_fence *f1,
return __dma_fence_is_later(f1->seqno, f2->seqno, f1->ops);
}
/**
* dma_fence_is_later_or_same - return true if f1 is later or same as f2
* @f1: the first fence from the same context
* @f2: the second fence from the same context
*
* Returns true if f1 is chronologically later than f2 or the same fence. Both
* fences must be from the same context, since a seqno is not re-used across
* contexts.
*/
static inline bool dma_fence_is_later_or_same(struct dma_fence *f1,
struct dma_fence *f2)
{
return f1 == f2 || dma_fence_is_later(f1, f2);
}
/**
* dma_fence_later - return the chronologically later fence
* @f1: the first fence from the same context