linux-kernel - [PATCH] swiotlb: Update the comment of swiotlb

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Message-ID: <1525691185-55657-1-git-send-email-xieyisheng1@huawei.com>
Date:   Mon, 7 May 2018 19:06:25 +0800
From:   Yisheng Xie <xieyisheng1@...wei.com>
To:     <konrad.wilk@...cle.com>, <mingo@...nel.org>, <hch@....de>
CC:     <iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
        Yisheng Xie <xieyisheng1@...wei.com>
Subject: [PATCH] swiotlb: Update the comment of swiotlb

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

Signed-off-by: Yisheng Xie <xieyisheng1@...wei.com>
---
 lib/swiotlb.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index fece575..e3d9445 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 @@ phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
 }
 
 /*
- * 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,
-- 
1.7.12.4