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dma-coherent: clarify dma_mmap_from_dev_coherent documentation 

The use of "correctly mapped" here is misleading, since it can give the
wrong expectation in the case that the memory *should* have been mapped
from the per-device pool, but doing so failed for other reasons.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Robin Murphy 2018-04-09 18:59:14 +01:00 committed by Christoph Hellwig
parent 504a918e67
commit 41d0bbc749
1 changed files with 3 additions and 2 deletions
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5
drivers/base/dma-coherent.c
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@ -312,8 +312,9 @@ static int __dma_mmap_from_coherent(struct dma_coherent_mem *mem,
* This checks whether the memory was allocated from the per-device * This checks whether the memory was allocated from the per-device
* coherent memory pool and if so, maps that memory to the provided vma. * coherent memory pool and if so, maps that memory to the provided vma.
* *
* Returns 1 if we correctly mapped the memory, or 0 if the caller should * Returns 1 if @vaddr belongs to the device coherent pool and the caller
* proceed with mapping memory from generic pools. * should return @ret, or 0 if they should proceed with mapping memory from
* generic areas.
*/ */
int dma_mmap_from_dev_coherent(struct device *dev, struct vm_area_struct *vma, int dma_mmap_from_dev_coherent(struct device *dev, struct vm_area_struct *vma,
void *vaddr, size_t size, int *ret) void *vaddr, size_t size, int *ret)