ath9k: correct expected max RX buffer size

commit b4b6cda2298b0c9a0af902312184b775b8867c65 upstream

We should only tell the hardware its capable of DMA'ing
to us only what we asked dev_alloc_skb(). Prior to this
it is possible a large RX'd frame could have corrupted
DMA data but for us but we were saved only because we
were previously also pci_map_single()'ing the same large
value. The issue prior to this though was we were unmapping
a smaller amount which the prior DMA patch fixed.

Signed-off-by: Bennyam Malavazi <Bennyam.Malavazi@atheros.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/net/wireless/ath9k/recv.c b/drivers/net/wireless/ath9k/recv.c
index 4d23827..0941589 100644 (file)
--- a/drivers/net/wireless/ath9k/recv.c
+++ b/drivers/net/wireless/ath9k/recv.c
@@ -52,7 +52,7 @@ static void ath_rx_buf_link(struct ath_softc *sc, struct ath_buf *bf)
        /* setup rx descriptors */
        ath9k_hw_setuprxdesc(ah,
                             ds,
-                            skb_tailroom(skb),   /* buffer size */
+                            sc->sc_rxbufsize,
                             0);
 
        if (sc->sc_rxlink == NULL)