Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b5a8e7362a0a5088ac080086d41cd98a54e0791b
Commit: b5a8e7362a0a5088ac080086d41cd98a54e0791b
Parent: 0d2372e5d61ccc1c618aaf5099700c8dc76e234a
Author: Haavard Skinnemoen <[EMAIL PROTECTED]>
AuthorDate: Fri Sep 7 16:00:25 2007 +0100
Committer: Haavard Skinnemoen <[EMAIL PROTECTED]>
CommitDate: Thu Oct 11 12:16:57 2007 +0200
[AVR32] Make dma_sync_*_for_cpu no-ops
I don't think the dma_sync_*_for_cpu ever did anything useful. We
flush the relevant cache lines when mapping the buffer or when calling
dma_sync_*_for_device(), and the CPU isn't allowed to touch the buffer
after that.
In other words, if these functions actually have anything to flush
from the caches, we're already in trouble.
Signed-off-by: Haavard Skinnemoen <[EMAIL PROTECTED]>
---
include/asm-avr32/dma-mapping.h | 17 ++++++++++-------
1 files changed, 10 insertions(+), 7 deletions(-)
diff --git a/include/asm-avr32/dma-mapping.h b/include/asm-avr32/dma-mapping.h
index 21bb60b..81e3426 100644
--- a/include/asm-avr32/dma-mapping.h
+++ b/include/asm-avr32/dma-mapping.h
@@ -264,7 +264,11 @@ static inline void
dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
size_t size, enum dma_data_direction direction)
{
- dma_cache_sync(dev, bus_to_virt(dma_handle), size, direction);
+ /*
+ * No need to do anything since the CPU isn't supposed to
+ * touch this memory after we flushed it at mapping- or
+ * sync-for-device time.
+ */
}
static inline void
@@ -309,12 +313,11 @@ static inline void
dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction direction)
{
- int i;
-
- for (i = 0; i < nents; i++) {
- dma_cache_sync(dev, page_address(sg[i].page) + sg[i].offset,
- sg[i].length, direction);
- }
+ /*
+ * No need to do anything since the CPU isn't supposed to
+ * touch this memory after we flushed it at mapping- or
+ * sync-for-device time.
+ */
}
static inline void
-
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