[017/289] ath9k: fix power save race conditions

Greg KH
2010-12-08T02:01:37Z

From: Luis R. Rodriguez <lrodriguez@atheros.com>

commit 8ab2cd09fecc8819bbaee2d0fd8f3a092d866ce3 upstream.

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: 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/net/wireless/ath/ath9k/main.c | 5 ++++-
drivers/net/wireless/ath/ath9k/recv.c | 3 +++
2 files changed, 7 insertions(+), 1 deletion(-)

--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1558,6 +1558,8 @@ static int ath9k_config(struct ieee80211
* 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;
/*
@@ -1572,7 +1574,7 @@ static int ath9k_config(struct ieee80211
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);
@@ -1587,6 +1589,7 @@ static int ath9k_config(struct ieee80211
}
}
}
+ spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
}

if (changed & IEEE80211_CONF_CHANGE_MONITOR) {
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -1096,6 +1096,7 @@ int ath_rx_tasklet(struct ath_softc *sc,
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;
@@ -1204,11 +1205,13 @@ int ath_rx_tasklet(struct ath_softc *sc,
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);

ath_rx_send_to_mac80211(hw, sc, skb, rxs);