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[v5.10,6/8] swiotlb: don't modify orig_addr in swiotlb_tbl_sync_single

Message ID 20210405210230.1707074-7-jxgao@google.com
State Superseded
Headers show
Series preserve DMA offsets when using swiotlb | expand

Commit Message

Jianxiong Gao April 5, 2021, 9:02 p.m. UTC 
From: Christoph Hellwig <hch@lst.de>

'commit 16fc3cef33a0 ("swiotlb: don't modify orig_addr in swiotlb_tbl_sync_single")'

swiotlb_tbl_map_single currently nevers sets a tlb_addr that is not
aligned to the tlb bucket size.  But we're going to add such a case
soon, for which this adjustment would be bogus.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jianxiong Gao <jxgao@google.com>
---
 kernel/dma/swiotlb.c | 1 -
 1 file changed, 1 deletion(-)
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Patch

diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index a3c0ccc53b8d..d1349971f099 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -639,7 +639,6 @@  void swiotlb_tbl_sync_single(struct device *hwdev, phys_addr_t tlb_addr,
 
 	if (orig_addr == INVALID_PHYS_ADDR)
 		return;
-	orig_addr += (unsigned long)tlb_addr & ((1 << IO_TLB_SHIFT) - 1);
 
 	switch (target) {
 	case SYNC_FOR_CPU: