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firewire: fw-ohci: use dma_alloc_coherent for ar_buffer

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Currently, we do nothing to guarantee we have a consistent DMA buffer for
asynchronous receive packets. Rather than doing several sync's following a
dma_map_single() to get consistent buffers, just switch to using
dma_alloc_coherent().

Resolves constant buffer failures on my own x86_64 laptop w/4GB of RAM and
likely to fix a number of other failures witnessed on x86_64 systems with
4GB of RAM or more.

Signed-off-by: Jarod Wilson <jwilson@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Jarod Wilson 2008-03-12 17:43:26 -04:00 committed by Stefan Richter
parent 6e45ef4c7a
commit bde1709aaa
1 changed files with 5 additions and 13 deletions
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18
drivers/firewire/fw-ohci.c
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@ -284,16 +284,10 @@ static int ar_context_add_page(struct ar_context *ctx)
dma_addr_t ab_bus;
size_t offset;
ab = (struct ar_buffer *) __get_free_page(GFP_ATOMIC);
ab = dma_alloc_coherent(dev, PAGE_SIZE, &ab_bus, GFP_ATOMIC);
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 |
@ -304,8 +298,6 @@ static int ar_context_add_page(struct ar_context *ctx)
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);
ctx->last_buffer->descriptor.branch_address = cpu_to_le32(ab_bus | 1);
ctx->last_buffer->next = ab;
ctx->last_buffer = ab;
@ -409,6 +401,7 @@ static void ar_context_tasklet(unsigned long data)
if (d->res_count == 0) {
size_t size, rest, offset;
dma_addr_t buffer_bus;
/*
* This descriptor is finished and we may have a
@ -417,9 +410,7 @@ static void ar_context_tasklet(unsigned long data)
*/
offset = offsetof(struct ar_buffer, data);
dma_unmap_single(ohci->card.device,
le32_to_cpu(ab->descriptor.data_address) - offset,
PAGE_SIZE, DMA_BIDIRECTIONAL);
buffer_bus = le32_to_cpu(ab->descriptor.data_address) - offset;
buffer = ab;
ab = ab->next;
@ -435,7 +426,8 @@ static void ar_context_tasklet(unsigned long data)
while (buffer < end)
buffer = handle_ar_packet(ctx, buffer);
free_page((unsigned long)buffer);
dma_free_coherent(ohci->card.device, PAGE_SIZE,
buffer, buffer_bus);
ar_context_add_page(ctx);
} else {
buffer = ctx->pointer;