The CPU must not touch the buffer after it was DMA-mapped.
Signed-off-by: Stefan Richter <[email protected]>
---
drivers/firewire/fw-ohci.c | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)
Index: linux/drivers/firewire/fw-ohci.c
===================================================================
--- linux.orig/drivers/firewire/fw-ohci.c
+++ linux/drivers/firewire/fw-ohci.c
@@ -253,12 +253,6 @@ static int ar_context_add_page(struct ar
if (ab == NULL)
return -ENOMEM;
- ab_bus = dma_map_single(dev, ab, PAGE_SIZE, DMA_BIDIRECTIONAL);
- if (dma_mapping_error(ab_bus)) {
- free_page((unsigned long) ab);
- return -ENOMEM;
- }
-
memset(&ab->descriptor, 0, sizeof(ab->descriptor));
ab->descriptor.control = cpu_to_le16(DESCRIPTOR_INPUT_MORE |
DESCRIPTOR_STATUS |
@@ -269,7 +263,11 @@ static int ar_context_add_page(struct ar
ab->descriptor.res_count = cpu_to_le16(PAGE_SIZE - offset);
ab->descriptor.branch_address = 0;
- dma_sync_single_for_device(dev, ab_bus, PAGE_SIZE, DMA_BIDIRECTIONAL);
+ ab_bus = dma_map_single(dev, ab, PAGE_SIZE, DMA_BIDIRECTIONAL);
+ if (dma_mapping_error(ab_bus)) {
+ free_page((unsigned long) ab);
+ return -ENOMEM;
+ }
ctx->last_buffer->descriptor.branch_address = cpu_to_le32(ab_bus | 1);
ctx->last_buffer->next = ab;
--
Stefan Richter
-=====-=-=== =-=- =----
http://arcgraph.de/sr/
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