diff options
| author | Luis R. Rodriguez <lrodriguez@atheros.com> | 2010-10-20 16:07:04 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-12-09 13:32:05 -0800 |
| commit | 43d7d3dec4052bb98790a26f67abbb01b5e1b9f3 (patch) | |
| tree | 95c3eb3d494d602c6b15135bca493be7650e2277 /drivers/net/wireless/ath | |
| parent | afa45b3276c604dab9d50875754b9f5ed0585847 (diff) | |
ath9k: add locking for starting the PCU on RX
commit 7583c550c3e635dcc61ab127c36ecefd59fb8dc8 upstream.
There was some locking for starting some parts of
RX but not for starting the PCU. Include this otherwise
we can content against stopping the PCU.
This can potentially lead to races against different
buffers on the PCU which can lead to to the DMA RX
engine writing to buffers which are already freed.
This is part of a series that will help resolve the bug:
https://bugzilla.kernel.org/show_bug.cgi?id=14624
For more details about this issue refer to:
http://marc.info/?l=linux-wireless&m=128629803703756&w=2
Cc: Ben Greear <greearb@candelatech.com>
Cc: Kyungwan Nam <kyungwan.nam@atheros.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Tested-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
index e581b1f..b3c9baf 100644
Diffstat (limited to 'drivers/net/wireless/ath')
| -rw-r--r-- | drivers/net/wireless/ath/ath9k/recv.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c index 8b1b459447d2..2a2b3f734000 100644 --- a/drivers/net/wireless/ath/ath9k/recv.c +++ b/drivers/net/wireless/ath/ath9k/recv.c @@ -288,11 +288,11 @@ static void ath_edma_start_recv(struct ath_softc *sc) ath_rx_addbuffer_edma(sc, ATH9K_RX_QUEUE_LP, sc->rx.rx_edma[ATH9K_RX_QUEUE_LP].rx_fifo_hwsize); - spin_unlock_bh(&sc->rx.rxbuflock); - ath_opmode_init(sc); ath9k_hw_startpcureceive(sc->sc_ah, (sc->sc_flags & SC_OP_OFFCHANNEL)); + + spin_unlock_bh(&sc->rx.rxbuflock); } static void ath_edma_stop_recv(struct ath_softc *sc) @@ -494,10 +494,11 @@ int ath_startrecv(struct ath_softc *sc) ath9k_hw_rxena(ah); start_recv: - spin_unlock_bh(&sc->rx.rxbuflock); ath_opmode_init(sc); ath9k_hw_startpcureceive(ah, (sc->sc_flags & SC_OP_OFFCHANNEL)); + spin_unlock_bh(&sc->rx.rxbuflock); + return 0; } |