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>
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 69c732c..16ace0e 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -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,
