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authorAlexandre Bounine <alexandre.bounine@idt.com>2016-08-03 00:06:34 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-08-03 02:35:33 +0300
commitf8e3a68c05f0f09a0da947b9d447268d2d3f8780 (patch)
treefe4c3503fea1a5bf0eb95d7c25adddab29de3b17 /drivers/rapidio/rio.c
parentcca446d4ce883ae28ff589dd1c9aef8d5148c7f7 (diff)
downloadlinux-f8e3a68c05f0f09a0da947b9d447268d2d3f8780.tar.xz
rapidio: fix return value description for dma_prep functions
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. Link: http://lkml.kernel.org/r/1469125134-16523-4-git-send-email-alexandre.bounine@idt.com Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: Andre van Herk <andre.van.herk@prodrive-technologies.com> Cc: Barry Wood <barry.wood@idt.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rapidio/rio.c')
-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,