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authorVasanthakumar Thiagarajan <vasanth@atheros.com>2008-12-15 20:40:46 +0530
committerJohn W. Linville <linville@tuxdriver.com>2008-12-19 15:23:26 -0500
commit9bf9fca8dea70116016d32c2bf3f83170c8fba76 (patch)
tree11840327a8e491e397e7980bb7f36aa80b3ae951 /drivers
parentf7a276a625e0b980185d2eb8e8e3e9425a708bee (diff)
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/wireless/ath9k/recv.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/net/wireless/ath9k/recv.c b/drivers/net/wireless/ath9k/recv.c
index cc160fe9f81..462e08c3d09 100644
--- a/drivers/net/wireless/ath9k/recv.c
+++ b/drivers/net/wireless/ath9k/recv.c
@@ -520,6 +520,15 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush)
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);