From 91f52e99824b0beebb48cad51bbda81437af8664 Mon Sep 17 00:00:00 2001 From: Baineng Shou Date: Wed, 14 Oct 2026 10:49:09 +0800 Subject: [PATCH] dma-buf/test: add KUnit case for dma_fence_dedup_array() empty input MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 77a9298741f8 ("dma-fence: Make dma_fence_dedup_array() robust against 0-count input"). Suggested-by: Christian König Reviewed-by: Christian König Signed-off-by: Baineng Shou Link: https://lore.kernel.org/r/20261014024909.1769215-1-shoubaineng@gmail.com Signed-off-by: Christian König --- drivers/dma-buf/st-dma-fence-unwrap.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/dma-buf/st-dma-fence-unwrap.c b/drivers/dma-buf/st-dma-fence-unwrap.c index 4d9d313b460c..c5353b36f0e4 100644 --- a/drivers/dma-buf/st-dma-fence-unwrap.c +++ b/drivers/dma-buf/st-dma-fence-unwrap.c @@ -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), {} };