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DMA-API: provide a helper to set both DMA and coherent DMA masks

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Provide a helper to set both the DMA and coherent DMA masks to the
same value - this avoids duplicated code in a number of drivers,
sometimes with buggy error handling, and also allows us identify
which drivers do things differently.

Signed-off-by: Russell King <[email protected]>
This commit is contained in:
Russell King 2013-06-26 13:49:44 +01:00
commit 4aa806b771
3 changed files with 44 additions and 15 deletions
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8
Documentation/DMA-API.txt
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@ -141,6 +141,14 @@ won't change the current mask settings. It is more intended as an
internal API for use by the platform than an external API for use by
driver writers.
int
dma_set_mask_and_coherent(struct device *dev, u64 mask)
Checks to see if the mask is possible and updates the device
streaming and coherent DMA mask parameters if it is.
Returns: 0 if successful and a negative error if not.
int
dma_set_mask(struct device *dev, u64 mask)