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Commit 7807c609 authored by Russell King's avatar Russell King Committed by Russell King
Browse files

[ARM] dma: fix some comments in dma-mapping.h 



... to prevent people being mislead.

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 309dbbab

arch/arm/include/asm/dma-mapping.h

+7 −8
Original line number Diff line number Diff line
@@ -297,8 +297,7 @@ static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr, 
 * or written back.

 *

 * The device owns this memory once this call has completed.  The CPU

 * can regain ownership by calling dma_unmap_page() or

 * dma_sync_single_for_cpu().

 * can regain ownership by calling dma_unmap_page().

 */

static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,

	     unsigned long offset, size_t size, enum dma_data_direction dir)
@@ -315,8 +314,8 @@ static inline dma_addr_t dma_map_page(struct device *dev, struct page *page, 
 * dma_unmap_single - unmap a single buffer previously mapped

 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices

 * @handle: DMA address of buffer

 * @size: size of buffer to map

 * @dir: DMA transfer direction

 * @size: size of buffer (same as passed to dma_map_single)

 * @dir: DMA transfer direction (same as passed to dma_map_single)

 *

 * Unmap a single streaming mode DMA translation.  The handle and size

 * must match what was provided in the previous dma_map_single() call.
@@ -336,11 +335,11 @@ static inline void dma_unmap_single(struct device *dev, dma_addr_t handle, 
 * dma_unmap_page - unmap a buffer previously mapped through dma_map_page()

 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices

 * @handle: DMA address of buffer

 * @size: size of buffer to map

 * @dir: DMA transfer direction

 * @size: size of buffer (same as passed to dma_map_page)

 * @dir: DMA transfer direction (same as passed to dma_map_page)

 *

 * Unmap a single streaming mode DMA translation.  The handle and size

 * must match what was provided in the previous dma_map_single() call.

 * Unmap a page streaming mode DMA translation.  The handle and size

 * must match what was provided in the previous dma_map_page() call.

 * All other usages are undefined.

 *

 * After this call, reads by the CPU to the buffer are guaranteed to see