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ath9k: fix power save race conditions

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ath9k has a race on putting the chip into network sleep and
having registers read from hardware. The race occurs because
although ath9k_ps_restore() locks its own callers it makes use
of some variables which get altered in the driver at different
code paths. The variables are the ps_enabled and ps_flags.

This is easily reprodicible in large network environments when
roaming with the wpa_supplicant simple bgscan. You'd get some
0xdeadbeef read out on certain registers such as:

ath: timeout (100000 us) on reg 0x806c: 0xdeadbeef & 0x01f00000 != 0x00000000
ath: RX failed to go idle in 10 ms RXSM=0xdeadbeef

ath: timeout (100000 us) on reg 0x7000: 0xdeadbeef & 0x00000003 != 0x00000000
ath: Chip reset failed

The fix is to protect the ath9k_config(hw, IEEE80211_CONF_CHANGE_PS)
calls with a spin_lock_irqsave() which will disable contendors for
these variables from interrupt context, timers, re-entry from mac80211
on the same callback, and most importantly from ath9k_ps_restore()
which is the only call which will put the device into network sleep.

There are quite a few threads and bug reports on these a few of them are:

https://bugs.launchpad.net/ubuntu/karmic/+source/linux/+bug/407040
http://code.google.com/p/chromium-os/issues/detail?id=5709
http://code.google.com/p/chromium-os/issues/detail?id=5943

Stable fixes apply to [2.6.32+]

Cc: stable@kernel.org
Cc: Paul Stewart <pstew@google.com>
Cc: Amod Bodas <amod.bodas@atheros.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Luis R. Rodriguez 2010-09-16 15:12:26 -04:00 committed by John W. Linville
parent 0f529e9849
commit 8ab2cd09fe
2 changed files with 7 additions and 1 deletions
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5
drivers/net/wireless/ath/ath9k/main.c
View File

@ -1554,6 +1554,8 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
* IEEE80211_CONF_CHANGE_PS is only passed by mac80211 for STA mode.
*/
if (changed & IEEE80211_CONF_CHANGE_PS) {
unsigned long flags;
spin_lock_irqsave(&sc->sc_pm_lock, flags);
if (conf->flags & IEEE80211_CONF_PS) {
sc->ps_flags |= PS_ENABLED;
/*
@ -1568,7 +1570,7 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
sc->ps_enabled = false;
sc->ps_flags &= ~(PS_ENABLED |
PS_NULLFUNC_COMPLETED);
ath9k_setpower(sc, ATH9K_PM_AWAKE);
ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_AWAKE);
if (!(ah->caps.hw_caps &
ATH9K_HW_CAP_AUTOSLEEP)) {
ath9k_hw_setrxabort(sc->sc_ah, 0);
@ -1583,6 +1585,7 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
}
}
}
spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
}
if (changed & IEEE80211_CONF_CHANGE_MONITOR) {

3
drivers/net/wireless/ath/ath9k/recv.c
View File

@ -1640,6 +1640,7 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
u8 rx_status_len = ah->caps.rx_status_len;
u64 tsf = 0;
u32 tsf_lower = 0;
unsigned long flags;
if (edma)
dma_type = DMA_BIDIRECTIONAL;
@ -1748,11 +1749,13 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
sc->rx.rxotherant = 0;
}
spin_lock_irqsave(&sc->sc_pm_lock, flags);
if (unlikely(ath9k_check_auto_sleep(sc) ||
(sc->ps_flags & (PS_WAIT_FOR_BEACON |
PS_WAIT_FOR_CAB |
PS_WAIT_FOR_PSPOLL_DATA))))
ath_rx_ps(sc, skb);
spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
if (ah->caps.hw_caps & ATH9K_HW_CAP_ANT_DIV_COMB)
ath_ant_comb_scan(sc, &rs);