[PATCH 6/7] swiotlb: Use swiotlb_sync_single instead of duplicating code

From: Becky Bruce
Date: Fri Apr 03 2009 - 21:58:06 EST


Right now both swiotlb_sync_single_range and swiotlb_sync_sg
were duplicating the code in swiotlb_sync_single. Just call it
instead. Also rearrange the sync_single code for readability.

Note that the swiotlb_sync_sg code was previously doing
a complicated comparison to determine if an addresses needed
to be unmapped where a simple is_swiotlb_buffer() call
would have sufficed.

Signed-off-by: Becky Bruce <beckyb@xxxxxxxxxxxxxxxxxxx>
---
lib/swiotlb.c | 30 ++++++++++++------------------
1 files changed, 12 insertions(+), 18 deletions(-)

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 602315b..c0f185a 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -732,10 +732,16 @@ swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
char *dma_addr = swiotlb_bus_to_virt(dev_addr);

BUG_ON(dir == DMA_NONE);
- if (is_swiotlb_buffer(dma_addr))
+
+ if (is_swiotlb_buffer(dma_addr)) {
sync_single(hwdev, dma_addr, size, dir, target);
- else if (dir == DMA_FROM_DEVICE)
- dma_mark_clean(dma_addr, size);
+ return;
+ }
+
+ if (dir != DMA_FROM_DEVICE)
+ return;
+
+ dma_mark_clean(dma_addr, size);
}

void
@@ -762,13 +768,7 @@ swiotlb_sync_single_range(struct device *hwdev, dma_addr_t dev_addr,
unsigned long offset, size_t size,
int dir, int target)
{
- char *dma_addr = swiotlb_bus_to_virt(dev_addr) + offset;
-
- BUG_ON(dir == DMA_NONE);
- if (is_swiotlb_buffer(dma_addr))
- sync_single(hwdev, dma_addr, size, dir, target);
- else if (dir == DMA_FROM_DEVICE)
- dma_mark_clean(dma_addr, size);
+ swiotlb_sync_single(hwdev, dev_addr + offset, size, dir, target);
}

void
@@ -892,15 +892,9 @@ swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl,
struct scatterlist *sg;
int i;

- BUG_ON(dir == DMA_NONE);
-
- for_each_sg(sgl, sg, nelems, i) {
- if (sg->dma_address != swiotlb_phys_to_bus(hwdev, sg_phys(sg)))
- sync_single(hwdev, swiotlb_bus_to_virt(sg->dma_address),
+ for_each_sg(sgl, sg, nelems, i)
+ swiotlb_sync_single(hwdev, sg->dma_address,
sg->dma_length, dir, target);
- else if (dir == DMA_FROM_DEVICE)
- dma_mark_clean(swiotlb_bus_to_virt(sg->dma_address), sg->dma_length);
- }
}

void
--
1.5.6.6

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