From a4375b45c59675a2f90b8a3656b7e57e8f8aa30b Mon Sep 17 00:00:00 2001
From: David Held <drheld@google.com>
Date: Tue, 13 May 2014 00:40:25 -0400
Subject: [PATCH] Make debug setting live modifiable for ath9k.

---
 drivers/net/wireless/ath/ath9k/init.c | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index 8894e96..5b99fe2 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -21,6 +21,7 @@
 #include <linux/ath9k_platform.h>
 #include <linux/module.h>
 #include <linux/relay.h>
+#include <linux/spinlock.h>
 #include <net/ieee80211_radiotap.h>
 
 #include "ath9k.h"
@@ -37,8 +38,23 @@ MODULE_DESCRIPTION("Support for Atheros 802.11n wireless LAN cards.");
 MODULE_SUPPORTED_DEVICE("Atheros 802.11n WLAN cards");
 MODULE_LICENSE("Dual BSD/GPL");
 
+static DEFINE_SPINLOCK(debug_lock);
 static unsigned int ath9k_debug = ATH_DBG_DEFAULT;
-module_param_named(debug, ath9k_debug, uint, 0);
+static int *ath_common_debug = NULL;
+static int ath9k_update_debug(const char *val, const struct kernel_param *kp) {
+	int ret = param_set_uint(val, kp);
+	if (ret < 0) return ret;
+
+	spin_lock(&debug_lock);
+	if (ath_common_debug) *ath_common_debug = ath9k_debug;
+	spin_unlock(&debug_lock);
+	return 0;
+}
+static const struct kernel_param_ops ath9k_debug_param_ops = {
+	.set = ath9k_update_debug,
+	.get = param_get_uint,
+};
+module_param_cb(debug, &ath9k_debug_param_ops, &ath9k_debug, 0644);
 MODULE_PARM_DESC(debug, "Debugging mask");
 
 int ath9k_modparam_nohwcrypt;
@@ -525,10 +541,14 @@ static int ath9k_init_softc(u16 devid, struct ath_softc *sc,
 	common->ah = ah;
 	common->hw = sc->hw;
 	common->priv = sc;
-	common->debug_mask = ath9k_debug;
 	common->btcoex_enabled = ath9k_btcoex_enable == 1;
 	common->disable_ani = false;
 
+	spin_lock(&debug_lock);
+	ath_common_debug = &common->debug_mask;
+	spin_unlock(&debug_lock);
+	common->debug_mask = ath9k_debug;
+
 	/*
 	 * Platform quirks.
 	 */
@@ -875,6 +895,9 @@ static void ath9k_deinit_softc(struct ath_softc *sc)
 void ath9k_deinit_device(struct ath_softc *sc)
 {
 	struct ieee80211_hw *hw = sc->hw;
+	spin_lock(&debug_lock);
+	ath_common_debug = NULL;
+	spin_unlock(&debug_lock);
 
 	ath9k_ps_wakeup(sc);
 
-- 
1.9.1.423.g4596e3a