linux-kernel - [PATCH 2/2] swiotlb: do not use sg

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Date:	Fri,  9 Jan 2009 18:32:10 +0000
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	linux-kernel@...r.kernel.org
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>, Ingo Molnar <mingo@...e.hu>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	jj@...osbits.net, weiyi.huang@...il.com,
	Becky Bruce <beckyb@...nel.crashing.org>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	Ian Campbell <ian.campbell@...rix.com>
Subject: [PATCH 2/2] swiotlb: do not use sg_virt()

Scatterlists containing HighMem pages do not have a useful virtual
address. Use the physical address instead.

Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
---
 lib/swiotlb.c |   14 +++++++-------
 1 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 31bae40..32e2bd3 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -801,10 +801,10 @@ swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
 	BUG_ON(dir == DMA_NONE);
 
 	for_each_sg(sgl, sg, nelems, i) {
-		void *addr = sg_virt(sg);
-		dma_addr_t dev_addr = swiotlb_virt_to_bus(hwdev, addr);
+		phys_addr_t paddr = sg_phys(sg);
+		dma_addr_t dev_addr = swiotlb_phys_to_bus(hwdev, paddr);
 
-		if (range_needs_mapping(sg_phys(sg), sg->length) ||
+		if (range_needs_mapping(paddr, sg->length) ||
 		    address_needs_mapping(hwdev, dev_addr, sg->length)) {
 			void *map = map_single(hwdev, sg_phys(sg),
 					       sg->length, dir);
@@ -848,11 +848,11 @@ swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
 	BUG_ON(dir == DMA_NONE);
 
 	for_each_sg(sgl, sg, nelems, i) {
-		if (sg->dma_address != swiotlb_virt_to_bus(hwdev, sg_virt(sg)))
+		if (sg->dma_address != swiotlb_phys_to_bus(hwdev, sg_phys(sg)))
 			unmap_single(hwdev, swiotlb_bus_to_virt(sg->dma_address),
 				     sg->dma_length, dir);
 		else if (dir == DMA_FROM_DEVICE)
-			dma_mark_clean(sg_virt(sg), sg->dma_length);
+			dma_mark_clean(swiotlb_bus_to_virt(sg->dma_address), sg->dma_length);
 	}
 }
 EXPORT_SYMBOL(swiotlb_unmap_sg_attrs);
@@ -882,11 +882,11 @@ swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl,
 	BUG_ON(dir == DMA_NONE);
 
 	for_each_sg(sgl, sg, nelems, i) {
-		if (sg->dma_address != swiotlb_virt_to_bus(hwdev, sg_virt(sg)))
+		if (sg->dma_address != swiotlb_phys_to_bus(hwdev, sg_phys(sg)))
 			sync_single(hwdev, swiotlb_bus_to_virt(sg->dma_address),
 				    sg->dma_length, dir, target);
 		else if (dir == DMA_FROM_DEVICE)
-			dma_mark_clean(sg_virt(sg), sg->dma_length);
+			dma_mark_clean(swiotlb_bus_to_virt(sg->dma_address), sg->dma_length);
 	}
 }
 
-- 
1.5.6.5

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