diff options
Diffstat (limited to 'drivers/net/wireless/ath9k/recv.c')
| -rw-r--r-- | drivers/net/wireless/ath9k/recv.c | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/drivers/net/wireless/ath9k/recv.c b/drivers/net/wireless/ath9k/recv.c index 743ad228b833..e49e32356e92 100644 --- a/drivers/net/wireless/ath9k/recv.c +++ b/drivers/net/wireless/ath9k/recv.c @@ -41,9 +41,12 @@ static void ath_rx_buf_link(struct ath_softc *sc, struct ath_buf *bf) ASSERT(skb != NULL); ds->ds_vdata = skb->data; - /* setup rx descriptors */ - ath9k_hw_setuprxdesc(ah, ds, - skb_tailroom(skb), /* buffer size */ + /* setup rx descriptors. The sc_rxbufsize here tells the harware + * how much data it can DMA to us and that we are prepared + * to process */ + ath9k_hw_setuprxdesc(ah, + ds, + sc->sc_rxbufsize, 0); if (sc->sc_rxlink == NULL) @@ -88,6 +91,13 @@ static struct sk_buff *ath_rxbuf_alloc(struct ath_softc *sc, u32 len) * in rx'd frames. */ + /* Note: the kernel can allocate a value greater than + * what we ask it to give us. We really only need 4 KB as that + * is this hardware supports and in fact we need at least 3849 + * as that is the MAX AMSDU size this hardware supports. + * Unfortunately this means we may get 8 KB here from the + * kernel... and that is actually what is observed on some + * systems :( */ skb = dev_alloc_skb(len + sc->sc_cachelsz - 1); if (skb != NULL) { off = ((unsigned long) skb->data) % sc->sc_cachelsz; @@ -298,7 +308,7 @@ int ath_rx_init(struct ath_softc *sc, int nbufs) bf->bf_mpdu = skb; bf->bf_buf_addr = pci_map_single(sc->pdev, skb->data, - skb_end_pointer(skb) - skb->head, + sc->sc_rxbufsize, PCI_DMA_FROMDEVICE); bf->bf_dmacontext = bf->bf_buf_addr; } @@ -544,9 +554,9 @@ 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, - skb_tailroom(skb), + pci_dma_sync_single_for_cpu(sc->pdev, + bf->bf_buf_addr, + sc->sc_rxbufsize, PCI_DMA_FROMDEVICE); pci_unmap_single(sc->pdev, bf->bf_buf_addr, sc->sc_rxbufsize, |