diff options
Diffstat (limited to 'package/mac80211/patches/409-ath9k-fix-race-with-IEEE80211_CONF_PS-checks.patch')
| -rw-r--r-- | package/mac80211/patches/409-ath9k-fix-race-with-IEEE80211_CONF_PS-checks.patch | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/package/mac80211/patches/409-ath9k-fix-race-with-IEEE80211_CONF_PS-checks.patch b/package/mac80211/patches/409-ath9k-fix-race-with-IEEE80211_CONF_PS-checks.patch new file mode 100644 index 0000000000..8aabe87f95 --- /dev/null +++ b/package/mac80211/patches/409-ath9k-fix-race-with-IEEE80211_CONF_PS-checks.patch @@ -0,0 +1,109 @@ +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)) { |