From 7d977508b0fb947e23d5092ec31daf5c2e35592e Mon Sep 17 00:00:00 2001
From: nbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Date: Thu, 1 Jul 2010 21:41:40 +0000
Subject: ath9k: fix false positives in the baseband hang check by repeating
 the test a few times before pronouncing the hardware dead and resetting it

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@22038 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
 .../mac80211/patches/540-ath9k_hang_check.patch    | 90 ++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 package/mac80211/patches/540-ath9k_hang_check.patch

diff --git a/package/mac80211/patches/540-ath9k_hang_check.patch b/package/mac80211/patches/540-ath9k_hang_check.patch
new file mode 100644
index 0000000000..85e03bc98c
--- /dev/null
+++ b/package/mac80211/patches/540-ath9k_hang_check.patch
@@ -0,0 +1,90 @@
+--- a/drivers/net/wireless/ath/ath9k/ath9k.h
++++ b/drivers/net/wireless/ath/ath9k/ath9k.h
+@@ -428,6 +428,7 @@ int ath_beaconq_config(struct ath_softc 
+ 
+ #define ATH_PAPRD_TIMEOUT	100 /* msecs */
+ 
++void ath_hw_check(struct work_struct *work);
+ void ath_paprd_calibrate(struct work_struct *work);
+ void ath_ani_calibrate(unsigned long data);
+ 
+@@ -563,6 +564,7 @@ struct ath_softc {
+ 	spinlock_t sc_pm_lock;
+ 	struct mutex mutex;
+ 	struct work_struct paprd_work;
++	struct work_struct hw_check_work;
+ 	struct completion paprd_complete;
+ 
+ 	u32 intrstatus;
+--- a/drivers/net/wireless/ath/ath9k/main.c
++++ b/drivers/net/wireless/ath/ath9k/main.c
+@@ -516,6 +516,25 @@ static void ath_node_detach(struct ath_s
+ 		ath_tx_node_cleanup(sc, an);
+ }
+ 
++void ath_hw_check(struct work_struct *work)
++{
++	struct ath_softc *sc = container_of(work, struct ath_softc, hw_check_work);
++	int i;
++
++	ath9k_ps_wakeup(sc);
++
++	for (i = 0; i < 3; i++) {
++		if (ath9k_hw_check_alive(sc->sc_ah))
++			goto out;
++
++		msleep(1);
++	}
++	ath_reset(sc, false);
++
++out:
++	ath9k_ps_restore(sc);
++}
++
+ void ath9k_tasklet(unsigned long data)
+ {
+ 	struct ath_softc *sc = (struct ath_softc *)data;
+@@ -527,13 +546,15 @@ void ath9k_tasklet(unsigned long data)
+ 
+ 	ath9k_ps_wakeup(sc);
+ 
+-	if ((status & ATH9K_INT_FATAL) ||
+-	    !ath9k_hw_check_alive(ah)) {
++	if (status & ATH9K_INT_FATAL) {
+ 		ath_reset(sc, false);
+ 		ath9k_ps_restore(sc);
+ 		return;
+ 	}
+ 
++	if (!ath9k_hw_check_alive(ah))
++		ieee80211_queue_work(sc->hw, &sc->hw_check_work);
++
+ 	if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
+ 		rxmask = (ATH9K_INT_RXHP | ATH9K_INT_RXLP | ATH9K_INT_RXEOL |
+ 			  ATH9K_INT_RXORN);
+@@ -1254,6 +1275,7 @@ static void ath9k_stop(struct ieee80211_
+ 
+ 	cancel_delayed_work_sync(&sc->tx_complete_work);
+ 	cancel_work_sync(&sc->paprd_work);
++	cancel_work_sync(&sc->hw_check_work);
+ 
+ 	if (!sc->num_sec_wiphy) {
+ 		cancel_delayed_work_sync(&sc->wiphy_work);
+@@ -1977,6 +1999,7 @@ static void ath9k_sw_scan_start(struct i
+ 	sc->sc_flags |= SC_OP_SCANNING;
+ 	del_timer_sync(&common->ani.timer);
+ 	cancel_work_sync(&sc->paprd_work);
++	cancel_work_sync(&sc->hw_check_work);
+ 	cancel_delayed_work_sync(&sc->tx_complete_work);
+ 	mutex_unlock(&sc->mutex);
+ }
+--- a/drivers/net/wireless/ath/ath9k/init.c
++++ b/drivers/net/wireless/ath/ath9k/init.c
+@@ -751,6 +751,7 @@ int ath9k_init_device(u16 devid, struct 
+ 			goto error_world;
+ 	}
+ 
++	INIT_WORK(&sc->hw_check_work, ath_hw_check);
+ 	INIT_WORK(&sc->paprd_work, ath_paprd_calibrate);
+ 	INIT_WORK(&sc->chan_work, ath9k_wiphy_chan_work);
+ 	INIT_DELAYED_WORK(&sc->wiphy_work, ath9k_wiphy_work);
-- 
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