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ath9k: Synchronize DMA transfer with CPU at right place 

This patch does pci_dma_sync_single_for_cpu() before accessing
the header of the frame and queueing the same buffer into h/w.

Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Vasanthakumar Thiagarajan 2008-12-15 20:40:46 +05:30 committed by John W. Linville
parent f7a276a625
commit 9bf9fca8de
1 changed files with 10 additions and 4 deletions
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14
drivers/net/wireless/ath9k/recv.c
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@ -519,6 +519,15 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush)
if (!skb)
continue;
/*
* Synchronize the DMA transfer with CPU before
* 1. accessing the frame
* 2. requeueing the same buffer to h/w
*/
pci_dma_sync_single_for_cpu(sc->pdev, bf->bf_buf_addr,
sc->rx.bufsize,
PCI_DMA_FROMDEVICE);
/*
* If we're asked to flush receive queue, directly
* chain it back at the queue without processing it.
@ -547,10 +556,7 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush)
if (!requeue_skb)
goto requeue;
/* Sync and unmap the frame */
pci_dma_sync_single_for_cpu(sc->pdev, bf->bf_buf_addr,
sc->rx.bufsize,
PCI_DMA_FROMDEVICE);
/* Unmap the frame */
pci_unmap_single(sc->pdev, bf->bf_buf_addr,
sc->rx.bufsize,
PCI_DMA_FROMDEVICE);