Update return value description for rio_dma_prep_... functions to include error-valued pointer that can be returned by HW mport device drivers. Return values from these functions must be checked using IS_ERR_OR_NULL macro.
This patch is applicable to kernel versions starting from v4.6-rc1. Signed-off-by: Alexandre Bounine <alexandre.boun...@idt.com> Cc: Matt Porter <mpor...@kernel.crashing.org> Cc: Andre van Herk <andre.van.h...@prodrive-technologies.com> Cc: Barry Wood <barry.w...@idt.com> Cc: linux-kernel@vger.kernel.org --- drivers/rapidio/rio.c | 8 ++++++-- 1 files changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c index 0dcaa66..8408029 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, -- 1.7.8.4