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Commit 9bf9fca8 authored by Vasanthakumar Thiagarajan's avatar Vasanthakumar Thiagarajan Committed by John W. Linville
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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: default avatarVasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent f7a276a6

drivers/net/wireless/ath9k/recv.c

+10 −4
Original line number Diff line number Diff line
@@ -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);