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dma-buf/test: add KUnit case for dma_fence_dedup_array() empty input

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Add a KUnit case verifying that dma_fence_dedup_array() returns 0,
not 1, when called with num_fences == 0. This locks down the
contract documented in the kernel-doc and prevents a regression
of commit 77a9298741 ("dma-fence: Make dma_fence_dedup_array()
robust against 0-count input").

Suggested-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Baineng Shou <shoubaineng@gmail.com>
Link: https://lore.kernel.org/r/20261014024909.1769215-1-shoubaineng@gmail.com
Signed-off-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
Baineng Shou 2026-10-14 10:49:09 +08:00 committed by Christian König
parent dfc3c7b84d
commit 91f52e9982
1 changed files with 10 additions and 0 deletions
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10
drivers/dma-buf/st-dma-fence-unwrap.c
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@ -370,6 +370,15 @@ static void test_unwrap_merge_seqno(struct kunit *test)
dma_fence_put(f1);
}
static void test_dedup_empty(struct kunit *test)
{
struct dma_fence *fence[1] = { NULL };
int ret;
ret = dma_fence_dedup_array(fence, 0);
KUNIT_EXPECT_EQ(test, ret, 0);
}
static void test_unwrap_merge_order(struct kunit *test)
{
struct dma_fence *fence, *f1, *f2, *a1, *a2, *c1, *c2;
@ -595,6 +604,7 @@ static struct kunit_case dma_fence_unwrap_cases[] = {
KUNIT_CASE(test_unwrap_merge_order),
KUNIT_CASE(test_unwrap_merge_complex),
KUNIT_CASE(test_unwrap_merge_complex_seqno),
KUNIT_CASE(test_dedup_empty),
{}
};