linux-kernel - [PATCH RFC] dma-buf: To check DMA_FENCE_FLAG_ENABLE_SIGNAL

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Date:   Thu, 4 Aug 2022 17:49:38 +0530
From:   Arvind Yadav <Arvind.Yadav@....com>
To:     <Christian.Koenig@....com>, <andrey.grodzovsky@....com>,
        <shashank.sharma@....com>, <amaranath.somalapuram@....com>,
        <Luben.Tuikov@....com>, <Alexander.Deucher@....com>,
        <sumit.semwal@...aro.org>, <linux-media@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>,
        <linaro-mm-sig@...ts.linaro.org>, <linux-kernel@...r.kernel.org>,
        <amd-gfx@...ts.freedesktop.org>
CC:     Arvind Yadav <Arvind.Yadav@....com>
Subject: [PATCH RFC] dma-buf: To check DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT status on debug

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@....com>
---
 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