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authorRussell King <rmk+kernel@arm.linux.org.uk>2013-06-26 13:49:44 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2013-09-17 15:32:37 +0100
commit4aa806b771d16b810771d86ce23c4c3160888db3 (patch)
tree5450d1495c1ffbb6d852df44002b95de275deb3f /include/linux
parent272b98c6455f00884f0350f775c5342358ebb73f (diff)
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DMA-API: provide a helper to set both DMA and coherent DMA masks
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>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/dma-mapping.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 3a8d0a2af607..ec951f98e3d9 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -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)