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From 841c7e339c4775f4cc614c92aaea82f70fcafbdb Mon Sep 17 00:00:00 2001
From: Gabor Juhos <juhosg@openwrt.org>
Date: Sun, 21 Jun 2009 16:59:53 +0200
Subject: [PATCH 1/3] ath9k: serialize ath9k_hw_setpower calls
Because ath9k_setpower is called from various contexts, we have to
protect it against concurrent calls.
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 | 15 ++++++++++++++-
drivers/net/wireless/ath/ath9k/main.c | 1 +
3 files changed, 16 insertions(+), 1 deletions(-)
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -544,6 +544,7 @@ struct ath_softc {
int irq;
spinlock_t sc_resetlock;
spinlock_t sc_serial_rw;
+ spinlock_t sc_pm_lock;
struct mutex mutex;
u8 curbssid[ETH_ALEN];
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -2738,7 +2738,8 @@ static bool ath9k_hw_set_power_awake(str
return true;
}
-bool ath9k_hw_setpower(struct ath_hw *ah, enum ath9k_power_mode mode)
+static bool ath9k_hw_setpower_nolock(struct ath_hw *ah,
+ enum ath9k_power_mode mode)
{
int status = true, setChip = true;
static const char *modes[] = {
@@ -2772,6 +2773,18 @@ bool ath9k_hw_setpower(struct ath_hw *ah
return status;
}
+bool ath9k_hw_setpower(struct ath_hw *ah, enum ath9k_power_mode mode)
+{
+ unsigned long flags;
+ bool ret;
+
+ spin_lock_irqsave(&ah->ah_sc->sc_pm_lock, flags);
+ ret = ath9k_hw_setpower_nolock(ah, mode);
+ spin_unlock_irqrestore(&ah->ah_sc->sc_pm_lock, flags);
+
+ return ret;
+}
+
/*
* Helper for ASPM support.
*
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1317,6 +1317,7 @@ static int ath_init(u16 devid, struct at
spin_lock_init(&sc->wiphy_lock);
spin_lock_init(&sc->sc_resetlock);
spin_lock_init(&sc->sc_serial_rw);
+ spin_lock_init(&sc->sc_pm_lock);
mutex_init(&sc->mutex);
tasklet_init(&sc->intr_tq, ath9k_tasklet, (unsigned long)sc);
tasklet_init(&sc->bcon_tasklet, ath_beacon_tasklet,
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