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authorYisheng Xie <xieyisheng1@huawei.com>2018-05-07 19:06:25 +0800
committerChristoph Hellwig <hch@lst.de>2018-05-09 09:35:20 +0200
commitd0c8ba40c6cc0fee18b0c458904e07817d6138e5 (patch)
tree0709d91861287fdb06eec966907f105bfae5a032
parent30fd642758773eb034b1543db26cf730ce12795c (diff)
downloadlinux-d0c8ba40c6cc0fee18b0c458904e07817d6138e5.tar.bz2
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>
-rw-r--r--lib/swiotlb.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 69c732c23773..16ace0e25d52 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -593,9 +593,8 @@ found:
}
/*
- * 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,