linux-kernel - [34-longterm 029/196] ath9k: fix a chip wakeup related crash in ath9k

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Date:	Mon, 12 Mar 2012 20:12:37 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	stable-review@...nel.org, Felix Fietkau <nbd@...nwrt.org>,
	"John W. Linville" <linville@...driver.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 029/196] ath9k: fix a chip wakeup related crash in ath9k_start

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

                   -------------------
    This is a commit scheduled for the next v2.6.34 longterm release.
    If you see a problem with using this for longterm, please comment.
                   -------------------

commit f62d816fc4324afbb7cf90110c70b6a14139b225 upstream.

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: John W. Linville <linville@...driver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 drivers/net/wireless/ath/ath9k/main.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 115e1ae..b9585fb 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1090,6 +1090,8 @@ static int ath9k_start(struct ieee80211_hw *hw)
 		  "Starting driver with initial channel: %d MHz\n",
 		  curchan->center_freq);
 
+	ath9k_ps_wakeup(sc);
+
 	mutex_lock(&sc->mutex);
 
 	if (ath9k_wiphy_started(sc)) {
@@ -1199,6 +1201,8 @@ static int ath9k_start(struct ieee80211_hw *hw)
 mutex_unlock:
 	mutex_unlock(&sc->mutex);
 
+	ath9k_ps_restore(sc);
+
 	return r;
 }
 
-- 
1.7.9.3

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