linux-kernel - [PATCH 2 of 9] revert "swiotlb: factor out copy to/from device."

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Date:	Mon, 22 Dec 2008 10:26:04 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Xen-devel <xen-devel@...ts.xensource.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Ian Campbell <ian.campbell@...rix.com>,
	Becky Bruce <beckyb@...nel.crashing.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Subject: [PATCH 2 of 9] revert "swiotlb: factor out copy to/from device."

git commit 1b548f667c1487d92e794a9f7a67788f49b952d8

---
 lib/swiotlb.c |   17 ++++-------------
 1 file changed, 4 insertions(+), 13 deletions(-)

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -335,15 +335,6 @@
 	return addr >= io_tlb_start && addr < io_tlb_end;
 }
 
-static void
-__sync_single(char *buffer, char *dma_addr, size_t size, int dir)
-{
-	if (dir == DMA_TO_DEVICE)
-		memcpy(dma_addr, buffer, size);
-	else
-		memcpy(buffer, dma_addr, size);
-}
-
 /*
  * Allocates bounce buffer and returns its kernel virtual address.
  */
@@ -445,7 +436,7 @@
 	for (i = 0; i < nslots; i++)
 		io_tlb_orig_addr[index+i] = buffer + (i << IO_TLB_SHIFT);
 	if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)
-		__sync_single(buffer, dma_addr, size, DMA_TO_DEVICE);
+		memcpy(dma_addr, buffer, size);
 
 	return dma_addr;
 }
@@ -469,7 +460,7 @@
 		 * bounce... copy the data back into the original buffer * and
 		 * delete the bounce buffer.
 		 */
-		__sync_single(buffer, dma_addr, size, DMA_FROM_DEVICE);
+		memcpy(buffer, dma_addr, size);
 
 	/*
 	 * Return the buffer to the free list by setting the corresponding
@@ -509,13 +500,13 @@
 	switch (target) {
 	case SYNC_FOR_CPU:
 		if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL))
-			__sync_single(buffer, dma_addr, size, DMA_FROM_DEVICE);
+			memcpy(buffer, dma_addr, size);
 		else
 			BUG_ON(dir != DMA_TO_DEVICE);
 		break;
 	case SYNC_FOR_DEVICE:
 		if (likely(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL))
-			__sync_single(buffer, dma_addr, size, DMA_TO_DEVICE);
+			memcpy(dma_addr, buffer, size);
 		else
 			BUG_ON(dir != DMA_FROM_DEVICE);
 		break;


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