Re: [PATCH 1/4] dma-buf: Check status of enable-signaling bit on debug

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On 9/5/2022 4:51 PM, Christian König wrote:
Am 05.09.22 um 12:56 schrieb Arvind Yadav:
The core DMA-buf framework needs to enable signaling
before the fence is signaled. The core DMA-buf framework
can forget to enable signaling before the fence is signaled.
To avoid this scenario on the debug kernel, check the
DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT status bit before checking
the signaling bit status to confirm that enable_signaling
is enabled.

You might want to put this patch at the end of the series to avoid breaking the kernel in between.

sure, I will add this patch at end.

Signed-off-by: Arvind Yadav <Arvind.Yadav@xxxxxxx>
---
  include/linux/dma-fence.h | 5 +++++
  1 file changed, 5 insertions(+)

diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h
index 775cdc0b4f24..60c0e935c0b5 100644
--- a/include/linux/dma-fence.h
+++ b/include/linux/dma-fence.h
@@ -428,6 +428,11 @@ dma_fence_is_signaled_locked(struct dma_fence *fence)
  static inline bool
  dma_fence_is_signaled(struct dma_fence *fence)
  {
+#ifdef CONFIG_DEBUG_FS

CONFIG_DEBUG_FS is certainly wrong, probably better to check for CONFIG_DEBUG_WW_MUTEX_SLOWPATH here.

Apart from that looks good to me,
Christian.

I will use CONFIG_DEBUG_WW_MUTEX_SLOWPATH instead of CONFIG_DEBUG_FS

~arvind

+    if (!test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT, &fence->flags))
+        return false;
+#endif
+
      if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags))
          return true;




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