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