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| author | Alexandre Bounine <alexandre.bounine@idt.com> | 2016-08-02 14:06:34 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-08-02 19:35:33 -0400 |
| commit | f8e3a68c05f0f09a0da947b9d447268d2d3f8780 (patch) | |
| tree | fe4c3503fea1a5bf0eb95d7c25adddab29de3b17 /drivers/rapidio | |
| parent | cca446d4ce883ae28ff589dd1c9aef8d5148c7f7 (diff) | |
| download | linux-f8e3a68c05f0f09a0da947b9d447268d2d3f8780.tar.bz2 | |
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')
| -rw-r--r-- | 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 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, |