[PATCH RFC] dma-buf: To check DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT status on debug

[Arvind Yadav]

If core DMA-buf framework forgets to call dma_fence_enable_signaling()
before calling the dma_fence_is_signaled(). To handle this scenario on
debug kernel the DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT needs to be checked
before checking the actual signaling status.

Signed-off-by: Arvind Yadav <Arvind.Yadav@xxxxxxx>
---
 include/linux/dma-fence.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h
index 775cdc0b4f24..7c95c8d5e5f5 100644
--- a/include/linux/dma-fence.h
+++ b/include/linux/dma-fence.h
@@ -428,6 +428,10 @@ dma_fence_is_signaled_locked(struct dma_fence *fence)
 static inline bool
 dma_fence_is_signaled(struct dma_fence *fence)
 {
+#ifdef CONFIG_DEBUG_FS
+	if (test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT, &fence->flags))
+		return true;
+#endif
 	if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags))
 		return true;
 
-- 
2.25.1