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From c96f9c17f71213a562ce20d85a7418d5549235cc Mon Sep 17 00:00:00 2001
From: Gabor Juhos <juhosg@openwrt.org>
Date: Fri, 24 Jul 2009 16:34:37 +0200
Subject: [PATCH 1/2] ath9k: fix race with IEEE80211_CONF_PS checks
There is a small window where the mac80211 changes the IEEE80211_CONF_PS
flag, and then informs the driver about the change. We have a race
condition if we are checking the flag in the same time. Avoid it by
introducing a local variable, and using that instead of checking the
IEEE80211_CONF_PS flag directly.
This fix the problem reported by Luis:
http://article.gmane.org/gmane.linux.kernel.wireless.general/34363
Changes-licensed-under: ISC
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
---
drivers/net/wireless/ath/ath9k/ath9k.h | 1 +
drivers/net/wireless/ath/ath9k/hw.c | 17 +++++++----------
drivers/net/wireless/ath/ath9k/hw.h | 1 -
drivers/net/wireless/ath/ath9k/main.c | 8 ++++----
4 files changed, 12 insertions(+), 15 deletions(-)
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -561,6 +561,7 @@ struct ath_softc {
u32 keymax;
DECLARE_BITMAP(keymap, ATH_KEYMAX);
u8 splitmic;
+ bool ps_enabled;
unsigned long ps_usecount;
enum ath9k_int imask;
enum ath9k_ht_extprotspacing ht_extprotspacing;
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -2793,10 +2793,8 @@ void ath9k_ps_wakeup(struct ath_softc *s
if (++sc->ps_usecount != 1)
goto unlock;
- if (sc->sc_ah->power_mode != ATH9K_PM_AWAKE) {
- sc->sc_ah->restore_mode = sc->sc_ah->power_mode;
+ if (sc->sc_ah->power_mode != ATH9K_PM_AWAKE)
ath9k_hw_setpower_nolock(sc->sc_ah, ATH9K_PM_AWAKE);
- }
unlock:
spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
@@ -2810,13 +2808,12 @@ void ath9k_ps_restore(struct ath_softc *
if (--sc->ps_usecount != 0)
goto unlock;
- if ((sc->hw->conf.flags & IEEE80211_CONF_PS) &&
- !(sc->sc_flags & (SC_OP_WAIT_FOR_BEACON |
- SC_OP_WAIT_FOR_CAB |
- SC_OP_WAIT_FOR_PSPOLL_DATA |
- SC_OP_WAIT_FOR_TX_ACK)))
- ath9k_hw_setpower_nolock(sc->sc_ah,
- sc->sc_ah->restore_mode);
+ if (sc->ps_enabled &&
+ !(sc->sc_flags & (SC_OP_WAIT_FOR_BEACON |
+ SC_OP_WAIT_FOR_CAB |
+ SC_OP_WAIT_FOR_PSPOLL_DATA |
+ SC_OP_WAIT_FOR_TX_ACK)))
+ ath9k_hw_setpower_nolock(sc->sc_ah, ATH9K_PM_NETWORK_SLEEP);
unlock:
spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -418,7 +418,6 @@ struct ath_hw {
enum nl80211_iftype opmode;
enum ath9k_power_mode power_mode;
- enum ath9k_power_mode restore_mode;
struct ath9k_nfcal_hist nfCalHist[NUM_NF_READINGS];
struct ar5416Stats stats;
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -496,8 +496,7 @@ static void ath9k_tasklet(unsigned long
if (status & ATH9K_INT_TX)
ath_tx_tasklet(sc);
- if ((status & ATH9K_INT_TSFOOR) &&
- (sc->hw->conf.flags & IEEE80211_CONF_PS)) {
+ if ((status & ATH9K_INT_TSFOOR) && sc->ps_enabled) {
/*
* TSF sync does not look correct; remain awake to sync with
* the next Beacon.
@@ -2001,7 +2000,7 @@ static int ath9k_tx(struct ieee80211_hw
goto exit;
}
- if (sc->hw->conf.flags & IEEE80211_CONF_PS) {
+ if (sc->ps_enabled) {
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
/*
* mac80211 does not set PM field for normal data frames, so we
@@ -2270,8 +2269,9 @@ static int ath9k_config(struct ieee80211
}
ath9k_hw_setrxabort(sc->sc_ah, 1);
}
- ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_NETWORK_SLEEP);
+ sc->ps_enabled = true;
} else {
+ sc->ps_enabled = false;
ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_AWAKE);
if (!(ah->caps.hw_caps &
ATH9K_HW_CAP_AUTOSLEEP)) {
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