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rapidio: fix return value description for dma_prep functions

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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/[email protected]
Signed-off-by: Alexandre Bounine <[email protected]>
Cc: Matt Porter <[email protected]>
Cc: Andre van Herk <[email protected]>
Cc: Barry Wood <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Alexandre Bounine 2016-08-02 14:06:34 -07:00 • committed by Linus Torvalds
commit f8e3a68c05
1 changed files with 6 additions and 2 deletions
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8
drivers/rapidio/rio.c
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@ -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,