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sfc: Allocate DMA and event rings using GFP_KERNEL 

Currently we allocate DMA descriptor rings and event rings using
pci_alloc_consistent() which selects non-blocking behaviour from the
page allocator (GFP_ATOMIC). This is unnecessary, and since we
currently allocate a single contiguous block for each ring (up to 32
pages!) these allocations are likely to fail if there is any
significant memory pressure.  Use dma_alloc_coherent() and GFP_KERNEL
instead.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings 2010-09-10 06:41:26 +00:00 committed by David S. Miller
parent e42de26249
commit 58758aa505
1 changed files with 4 additions and 4 deletions
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8
drivers/net/sfc/nic.c
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@ -263,8 +263,8 @@ static int efx_alloc_special_buffer(struct efx_nic *efx,
{
len = ALIGN(len, EFX_BUF_SIZE);
buffer->addr = pci_alloc_consistent(efx->pci_dev, len,
&buffer->dma_addr);
buffer->addr = dma_alloc_coherent(&efx->pci_dev->dev, len,
&buffer->dma_addr, GFP_KERNEL);
if (!buffer->addr)
return -ENOMEM;
buffer->len = len;
@ -301,8 +301,8 @@ efx_free_special_buffer(struct efx_nic *efx, struct efx_special_buffer *buffer)
(u64)buffer->dma_addr, buffer->len,
buffer->addr, (u64)virt_to_phys(buffer->addr));
pci_free_consistent(efx->pci_dev, buffer->len, buffer->addr,
buffer->dma_addr);
dma_free_coherent(&efx->pci_dev->dev, buffer->len, buffer->addr,
buffer->dma_addr);
buffer->addr = NULL;
buffer->entries = 0;
}