[lkml]   [2010]   [Dec]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[031/289] ath9k: add locking for stopping RX
2.6.36-stable review patch.  If anyone has any objections, please let us know.


From: Luis R. Rodriguez <>

commit 1e450285281bdf766272c181ecd43d4f2f0711ce upstream.

ath9k locks for starting RX but not for stopping RX. We could
potentially run into a situation where tried to stop RX
but immediately started RX. This allows for races on the
the RX engine deciding what buffer we last left off on
and could potentially cause ath9k to DMA into already
free'd memory or in the worst case at a later time to
already given memory to other drivers.

Fix this by locking stopping RX.

This is part of a series that will help resolve the bug:

For more details about this issue refer to:

Cc: Ben Greear <>
Cc: Kyungwan Nam <>
Signed-off-by: Luis R. Rodriguez <>
Tested-by: Ben Greear <>
Signed-off-by: John W. Linville <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/net/wireless/ath/ath9k/recv.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -297,10 +297,8 @@ static void ath_edma_start_recv(struct a

static void ath_edma_stop_recv(struct ath_softc *sc)
- spin_lock_bh(&sc->rx.rxbuflock);
ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_HP);
ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_LP);
- spin_unlock_bh(&sc->rx.rxbuflock);

int ath_rx_init(struct ath_softc *sc, int nbufs)
@@ -508,6 +506,7 @@ bool ath_stoprecv(struct ath_softc *sc)
struct ath_hw *ah = sc->sc_ah;
bool stopped;

+ spin_lock_bh(&sc->rx.rxbuflock);
ath9k_hw_setrxfilter(ah, 0);
stopped = ath9k_hw_stopdmarecv(ah);
@@ -516,6 +515,7 @@ bool ath_stoprecv(struct ath_softc *sc)
sc->rx.rxlink = NULL;
+ spin_unlock_bh(&sc->rx.rxbuflock);

return stopped;

 \ /
  Last update: 2010-12-08 03:01    [W:0.588 / U:0.860 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site