Try to recycle an dma_fence_array object by dropping the last reference to it without freeing it.
v2: fix the WARN_ON_ONCE recycle test after rebase
Signed-off-by: Christian König christian.koenig@amd.com --- drivers/dma-buf/dma-fence-array.c | 28 ++++++++++++++++++++++++++++ include/linux/dma-fence-array.h | 1 + 2 files changed, 29 insertions(+)
diff --git a/drivers/dma-buf/dma-fence-array.c b/drivers/dma-buf/dma-fence-array.c index 4664607f0abc..ea7713b40514 100644 --- a/drivers/dma-buf/dma-fence-array.c +++ b/drivers/dma-buf/dma-fence-array.c @@ -198,6 +198,34 @@ void dma_fence_array_init(struct dma_fence_array *array, u64 context, } EXPORT_SYMBOL(dma_fence_array_init);
+/** + * dma_fence_array_reuse - dummy for dma_fence_array_recycle + */ +static void dma_fence_array_reuse(struct kref *kref) +{ + struct dma_fence_array *array = container_of(kref, typeof(*array), + base.refcount); + + if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &array->base.flags)) + WARN_ON_ONCE(!list_empty(&array->base.cb_list)); +} + +/** + * dma_fence_array_try_reuse - try to reuse a dma_fence_array object + * @array: array which we should try to reuse + * + * Try to drop the last reference to an dma_fence_array and so allow it to be + * reused. + * + * Returns true if this was the last reference then caller can reuse the array. + * In this case the array is reset into a state where it can be used with + * dma_fence_array_init again. + */ +bool dma_fence_array_recycle(struct dma_fence_array *array) +{ + return kref_put(&array->base.refcount, dma_fence_array_reuse); +} + /** * dma_fence_array_free - free a dma_fence_array object * @array: the object to free diff --git a/include/linux/dma-fence-array.h b/include/linux/dma-fence-array.h index be85c06b524d..35d1d1e7c93b 100644 --- a/include/linux/dma-fence-array.h +++ b/include/linux/dma-fence-array.h @@ -93,6 +93,7 @@ struct dma_fence_array *dma_fence_array_alloc(int num_fences, struct dma_fence **fences); void dma_fence_array_init(struct dma_fence_array *array, u64 context, unsigned int seqno, bool signal_on_any); +bool dma_fence_array_recycle(struct dma_fence_array *array); void dma_fence_array_free(struct dma_fence_array *array);
/**