On 10/14/26 04:49, Baineng Shou wrote:

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 christian.koenig@amd.com Reviewed-by: Christian König christian.koenig@amd.com Signed-off-by: Baineng Shou shoubaineng@gmail.com

Thanks for the reminder, I had to wait for the -fixes backmerge to push this.

I've just pushed the patch to drm-misc-next.

Regards, Christian.

---

Changes in v2:

• Add Reviewed-by from Christian.
• Rebase onto v7.3-rc7.

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), {}

};