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swiotlb: update comments to refer to physical instead of virtual addresses 

swiotlb use physical address of bounce buffer when do map and unmap,
therefore, related comment should be updated.

Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Yisheng Xie 2018-05-07 19:06:25 +08:00 committed by Christoph Hellwig
parent 30fd642758
commit d0c8ba40c6
1 changed files with 2 additions and 3 deletions
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5
lib/swiotlb.c
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@ -593,9 +593,8 @@ phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
}
/*
* Allocates bounce buffer and returns its kernel virtual address.
* Allocates bounce buffer and returns its physical address.
*/
static phys_addr_t
map_single(struct device *hwdev, phys_addr_t phys, size_t size,
enum dma_data_direction dir, unsigned long attrs)
@ -614,7 +613,7 @@ map_single(struct device *hwdev, phys_addr_t phys, size_t size,
}
/*
* dma_addr is the kernel virtual address of the bounce buffer to unmap.
* tlb_addr is the physical address of the bounce buffer to unmap.
*/
void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
size_t size, enum dma_data_direction dir,