mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-09 08:35:19 +02:00
110 lines
3.8 KiB
Diff
110 lines
3.8 KiB
Diff
|
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)) {
|