mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-28 12:27:32 +02:00
83 lines
2.6 KiB
Diff
83 lines
2.6 KiB
Diff
|
From 7446da6910f1368273a55ca99acba18828306a6e Mon Sep 17 00:00:00 2001
|
||
|
|
From: Gabor Juhos <juhosg@openwrt.org>
|
||
|
|
Date: Sun, 21 Jun 2009 16:59:53 +0200
|
||
|
|
Subject: [PATCH 3/3] ath9k: serialize ath9k_ps_{wakeup,restore} calls
|
||
|
|
|
||
|
|
These functions are changing the power mode of the chip, but this may
|
||
|
|
have unpredictable effects, if another code are trying to set the power
|
||
|
|
mode via 'ath9k_hw_setpower' in the same time from another context.
|
||
|
|
|
||
|
|
Changes-licensed-under: ISC
|
||
|
|
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
|
||
|
|
---
|
||
|
|
drivers/net/wireless/ath/ath9k/ath9k.h | 2 +-
|
||
|
|
drivers/net/wireless/ath/ath9k/hw.c | 42 ++++++++++++++++++++++----------
|
||
|
|
2 files changed, 30 insertions(+), 14 deletions(-)
|
||
|
|
|
||
|
|
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
|
||
|
|
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
|
||
|
|
@@ -561,7 +561,7 @@ struct ath_softc {
|
||
|
|
u32 keymax;
|
||
|
|
DECLARE_BITMAP(keymap, ATH_KEYMAX);
|
||
|
|
u8 splitmic;
|
||
|
|
- atomic_t ps_usecount;
|
||
|
|
+ unsigned long ps_usecount;
|
||
|
|
enum ath9k_int imask;
|
||
|
|
enum ath9k_ht_extprotspacing ht_extprotspacing;
|
||
|
|
enum ath9k_ht_macmode tx_chan_width;
|
||
|
|
--- a/drivers/net/wireless/ath/ath9k/hw.c
|
||
|
|
+++ b/drivers/net/wireless/ath/ath9k/hw.c
|
||
|
|
@@ -2787,23 +2787,39 @@ bool ath9k_hw_setpower(struct ath_hw *ah
|
||
|
|
|
||
|
|
void ath9k_ps_wakeup(struct ath_softc *sc)
|
||
|
|
{
|
||
|
|
- if (atomic_inc_return(&sc->ps_usecount) == 1)
|
||
|
|
- if (sc->sc_ah->power_mode != ATH9K_PM_AWAKE) {
|
||
|
|
- sc->sc_ah->restore_mode = sc->sc_ah->power_mode;
|
||
|
|
- ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_AWAKE);
|
||
|
|
- }
|
||
|
|
+ unsigned long flags;
|
||
|
|
+
|
||
|
|
+ spin_lock_irqsave(&sc->sc_pm_lock, flags);
|
||
|
|
+ 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;
|
||
|
|
+ ath9k_hw_setpower_nolock(sc->sc_ah, ATH9K_PM_AWAKE);
|
||
|
|
+ }
|
||
|
|
+
|
||
|
|
+ unlock:
|
||
|
|
+ spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
void ath9k_ps_restore(struct ath_softc *sc)
|
||
|
|
{
|
||
|
|
- if (atomic_dec_and_test(&sc->ps_usecount))
|
||
|
|
- 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(sc->sc_ah,
|
||
|
|
- sc->sc_ah->restore_mode);
|
||
|
|
+ unsigned long flags;
|
||
|
|
+
|
||
|
|
+ spin_lock_irqsave(&sc->sc_pm_lock, flags);
|
||
|
|
+ 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);
|
||
|
|
+
|
||
|
|
+ unlock:
|
||
|
|
+ spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|