Allow for some users to surreptiously insert lazy signal callbacks that
do not depend on enabling the signaling mechanism around every fence.
This means that we may have a cb_list even if the signaling bit is not
enabled, so always notify the callbacks.
The cost is that dma_fence_signal() must always acquire the spinlock to
ensure that the cb_list is flushed.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/dma-buf/dma-fence.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c
index 027a6a894abd..ab4a456bba04 100644
--- a/drivers/dma-buf/dma-fence.c
+++ b/drivers/dma-buf/dma-fence.c
@@ -170,11 +170,9 @@ int dma_fence_signal(struct dma_fence *fence)
__dma_fence_signal__timestamp(fence, ktime_get());
- if (test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT, &fence->flags)) {
- spin_lock_irqsave(fence->lock, flags);
- __dma_fence_signal__notify(fence);
- spin_unlock_irqrestore(fence->lock, flags);
- }
+ spin_lock_irqsave(fence->lock, flags);
+ __dma_fence_signal__notify(fence);
+ spin_unlock_irqrestore(fence->lock, flags);
return 0;
}
EXPORT_SYMBOL(dma_fence_signal);
--
2.20.1
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