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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 <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2013-06-26 13:49:44 +01:00
parent 272b98c645
commit 4aa806b771
3 changed files with 44 additions and 15 deletions
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14
include/linux/dma-mapping.h
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@@ -97,6 +97,20 @@ static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
}
#endif
/*
* Set both the DMA mask and the coherent DMA mask to the same thing.
* Note that we don't check the return value from dma_set_coherent_mask()
* as the DMA API guarantees that the coherent DMA mask can be set to
* the same or smaller than the streaming DMA mask.
*/
static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask)
{
int rc = dma_set_mask(dev, mask);
if (rc == 0)
dma_set_coherent_mask(dev, mask);
return rc;
}
extern u64 dma_get_required_mask(struct device *dev);
static inline unsigned int dma_get_max_seg_size(struct device *dev)