linux-kernel - [PATCH] ath9k: correct expected max RX buffer size

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Date:	Tue, 2 Dec 2008 12:51:21 -0800
From:	"Luis R. Rodriguez" <lrodriguez@...eros.com>
To:	<stable@...nel.org>
CC:	<ath9k-devel@...ts.ath9k.org>, <linux-wireless@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <sfr@...b.auug.org.au>,
	"Luis R. Rodriguez" <lrodriguez@...eros.com>,
	Bennyam Malavazi <Bennyam.Malavazi@...eros.com>
Subject: [PATCH] ath9k: correct expected max RX buffer size

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@...eros.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@...eros.com>
---
 drivers/net/wireless/ath9k/recv.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/net/wireless/ath9k/recv.c b/drivers/net/wireless/ath9k/recv.c
index 4d23827..0941589 100644
--- 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)
-- 
1.5.6.rc2.15.g457bb.dirty

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