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-rw-r--r--drivers/rapidio/rio.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c
index 0dcaa660cba1..840802943dc0 100644
--- a/drivers/rapidio/rio.c
+++ b/drivers/rapidio/rio.c
@@ -1848,7 +1848,9 @@ EXPORT_SYMBOL_GPL(rio_release_dma);
* Initializes RapidIO capable DMA channel for the specified data transfer.
* Uses DMA channel private extension to pass information related to remote
* target RIO device.
- * Returns pointer to DMA transaction descriptor or NULL if failed.
+ *
+ * Returns: pointer to DMA transaction descriptor if successful,
+ * error-valued pointer or NULL if failed.
*/
struct dma_async_tx_descriptor *rio_dma_prep_xfer(struct dma_chan *dchan,
u16 destid, struct rio_dma_data *data,
@@ -1883,7 +1885,9 @@ EXPORT_SYMBOL_GPL(rio_dma_prep_xfer);
* Initializes RapidIO capable DMA channel for the specified data transfer.
* Uses DMA channel private extension to pass information related to remote
* target RIO device.
- * Returns pointer to DMA transaction descriptor or NULL if failed.
+ *
+ * Returns: pointer to DMA transaction descriptor if successful,
+ * error-valued pointer or NULL if failed.
*/
struct dma_async_tx_descriptor *rio_dma_prep_slave_sg(struct rio_dev *rdev,
struct dma_chan *dchan, struct rio_dma_data *data,