linux-kernel - [PATCH] [81/106] ath9k: fix a chip wakeup related crash in ath9k

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Message-Id: <20110426211403.01A533E1886@tassilo.jf.intel.com>
Date:	Tue, 26 Apr 2011 14:14:02 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	nbd@...nwrt.org, ak@...ux.intel.com, stable@...nel.org,
	linville@...driver.com, linux-kernel@...r.kernel.org,
	stable@...nel.org, tim.bird@...sony.com
Subject: [PATCH] [81/106] ath9k: fix a chip wakeup related crash in ath9k_start

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Felix Fietkau <nbd@...nwrt.org>

[ upstream commit f62d816fc4324afbb7cf90110c70b6a14139b225 ]

When the chip is still asleep when ath9k_start is called,
ath9k_hw_configpcipowersave can trigger a data bus error.

Signed-off-by: Felix Fietkau <nbd@...nwrt.org>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Cc: stable@...nel.org
Signed-off-by: John W. Linville <linville@...driver.com>

Index: linux-2.6.35.y/drivers/net/wireless/ath/ath9k/main.c
===================================================================
--- linux-2.6.35.y.orig/drivers/net/wireless/ath/ath9k/main.c
+++ linux-2.6.35.y/drivers/net/wireless/ath/ath9k/main.c
@@ -1124,6 +1124,8 @@ static int ath9k_start(struct ieee80211_
 		  "Starting driver with initial channel: %d MHz\n",
 		  curchan->center_freq);
 
+	ath9k_ps_wakeup(sc);
+
 	mutex_lock(&sc->mutex);
 
 	if (ath9k_wiphy_started(sc)) {
@@ -1238,6 +1240,8 @@ static int ath9k_start(struct ieee80211_
 mutex_unlock:
 	mutex_unlock(&sc->mutex);
 
+	ath9k_ps_restore(sc);
+
 	return r;
 }
 
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