I wrote:
> The CPU must not touch the buffer after it was DMA-mapped.
>
> Signed-off-by: Stefan Richter <[email protected]>
> ---
> drivers/firewire/fw-ohci.c | 1 +
> 1 file changed, 1 insertion(+)
>
> Index: linux/drivers/firewire/fw-ohci.c
> ===================================================================
> --- linux.orig/drivers/firewire/fw-ohci.c
> +++ linux/drivers/firewire/fw-ohci.c
> @@ -258,6 +258,7 @@ static int ar_context_add_page(struct ar
> free_page((unsigned long) ab);
> return -ENOMEM;
> }
> + dma_sync_single_for_cpu(dev, ab_bus, PAGE_SIZE, DMA_BIDIRECTIONAL);
>
> memset(&ab->descriptor, 0, sizeof(ab->descriptor));
> ab->descriptor.control = cpu_to_le16(DESCRIPTOR_INPUT_MORE |
>
This is still not complete:
in ar_context_add_page():
ctx->last_buffer->descriptor.branch_address = ...;
in ar_context_tasklet():
dma_unmap_single(ohci->card.device,
le32_to_cpu(ab->descriptor.data_address) - offset,
PAGE_SIZE, DMA_BIDIRECTIONAL);
They both access DMA-mapped areas.
--
Stefan Richter
-=====-=-=== =-=- =----
http://arcgraph.de/sr/
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