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iwlagn: fix DMA sync 

For the RX DMA fix for iwlwifi ("iwlagn: fix RX skb alignment") Luis
pointed out:

> aligned_dma_addr can obviously be > real_dma_addr at this point, what
> guarantees we can use it on our own whim?

I asked around, and he's right, there may be platforms that do not allow
passing such such an address to the DMA API functions. This patch
changes it by using the proper dma_sync_single_range_for_cpu API
invented for this purpose.

Cc: Luis R. Rodriguez <mcgrof@gmail.com>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2008-11-19 01:22:51 +01:00 committed by John W. Linville
parent 7e56b5d698
commit e91af0af86
1 changed files with 5 additions and 3 deletions
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8
drivers/net/wireless/iwlwifi/iwl-agn.c
View File

@ -1384,9 +1384,11 @@ void iwl_rx_handle(struct iwl_priv *priv)
rxq->queue[i] = NULL;
pci_dma_sync_single_for_cpu(priv->pci_dev, rxb->aligned_dma_addr,
priv->hw_params.rx_buf_size,
PCI_DMA_FROMDEVICE);
dma_sync_single_range_for_cpu(
&priv->pci_dev->dev, rxb->real_dma_addr,
rxb->aligned_dma_addr - rxb->real_dma_addr,
priv->hw_params.rx_buf_size,
PCI_DMA_FROMDEVICE);
pkt = (struct iwl_rx_packet *)rxb->skb->data;
/* Reclaim a command buffer only if this packet is a response