Change how dma_fence_add_callback() behaves, when the fence
has error-signaled by the time it is being add. After this commit,
dma_fence_add_callback() returns the fence error, if it
has error-signaled before dma_fence_add_callback() is called.
Signed-off-by: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxx>
---
drivers/dma-buf/dma-fence.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c
index 4edb9fd3cf47..298b440c5b68 100644
--- a/drivers/dma-buf/dma-fence.c
+++ b/drivers/dma-buf/dma-fence.c
@@ -226,7 +226,8 @@ EXPORT_SYMBOL(dma_fence_enable_sw_signaling);
*
* Note that the callback can be called from an atomic context. If
* fence is already signaled, this function will return -ENOENT (and
- * *not* call the callback)
+ * *not* call the callback). If the fence is error-signaled, this
+ * function returns the fence error.
*
* Add a software callback to the fence. Same restrictions apply to
* refcount as it does to dma_fence_wait, however the caller doesn't need to
@@ -235,8 +236,8 @@ EXPORT_SYMBOL(dma_fence_enable_sw_signaling);
* after it signals with dma_fence_signal. The callback itself can be called
* from irq context.
*
- * Returns 0 in case of success, -ENOENT if the fence is already signaled
- * and -EINVAL in case of error.
+ * Returns 0 in case of success, -ENOENT (or the error value) if the fence is
+ * already signaled and -EINVAL in case of error.
*/
int dma_fence_add_callback(struct dma_fence *fence, struct dma_fence_cb *cb,
dma_fence_func_t func)
@@ -250,7 +251,8 @@ int dma_fence_add_callback(struct dma_fence *fence, struct dma_fence_cb *cb,
if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) {
INIT_LIST_HEAD(&cb->node);
- return -ENOENT;
+ ret = (fence->error < 0) ? fence->error : -ENOENT;
+ return ret;
}
spin_lock_irqsave(fence->lock, flags);
--
2.16.3
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