1 files changed, 73 insertions, 54 deletions

diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 3be18d9..5ed615f 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -32,6 +32,9 @@
  * rely on some SHA1 checksum of the regdomain for example.
  *
  */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/list.h>
@@ -48,7 +51,7 @@
 #ifdef CONFIG_CFG80211_REG_DEBUG
 #define REG_DBG_PRINT(format, args...) \
 	do { \
-		printk(KERN_DEBUG "cfg80211: " format , ## args); \
+		printk(KERN_DEBUG pr_fmt(format), ##args);	\
 	} while (0)
 #else
 #define REG_DBG_PRINT(args...)
@@ -96,6 +99,9 @@ struct reg_beacon {
 	struct ieee80211_channel chan;
 };
 
+static void reg_todo(struct work_struct *work);
+static DECLARE_WORK(reg_work, reg_todo);
+
 /* We keep a static world regulatory domain in case of the absence of CRDA */
 static const struct ieee80211_regdomain world_regdom = {
 	.n_reg_rules = 5,
@@ -367,11 +373,10 @@ static int call_crda(const char *alpha2)
 	};
 
 	if (!is_world_regdom((char *) alpha2))
-		printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n",
+		pr_info("Calling CRDA for country: %c%c\n",
 			alpha2[0], alpha2[1]);
 	else
-		printk(KERN_INFO "cfg80211: Calling CRDA to update world "
-			"regulatory domain\n");
+		pr_info("Calling CRDA to update world regulatory domain\n");
 
 	/* query internal regulatory database (if it exists) */
 	reg_regdb_query(alpha2);
@@ -1317,6 +1322,21 @@ static int ignore_request(struct wiphy *wiphy,
 	return -EINVAL;
 }
 
+static void reg_set_request_processed(void)
+{
+	bool need_more_processing = false;
+
+	last_request->processed = true;
+
+	spin_lock(&reg_requests_lock);
+	if (!list_empty(&reg_requests_list))
+		need_more_processing = true;
+	spin_unlock(&reg_requests_lock);
+
+	if (need_more_processing)
+		schedule_work(&reg_work);
+}
+
 /**
  * __regulatory_hint - hint to the wireless core a regulatory domain
  * @wiphy: if the hint comes from country information from an AP, this
@@ -1392,8 +1412,10 @@ new_request:
 		 * have applied the requested regulatory domain before we just
 		 * inform userspace we have processed the request
 		 */
-		if (r == -EALREADY)
+		if (r == -EALREADY) {
 			nl80211_send_reg_change_event(last_request);
+			reg_set_request_processed();
+		}
 		return r;
 	}
 
@@ -1409,16 +1431,13 @@ static void reg_process_hint(struct regulatory_request *reg_request)
 
 	BUG_ON(!reg_request->alpha2);
 
-	mutex_lock(&cfg80211_mutex);
-	mutex_lock(&reg_mutex);
-
 	if (wiphy_idx_valid(reg_request->wiphy_idx))
 		wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
 
 	if (reg_request->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
 	    !wiphy) {
 		kfree(reg_request);
-		goto out;
+		return;
 	}
 
 	r = __regulatory_hint(wiphy, reg_request);
@@ -1426,28 +1445,46 @@ static void reg_process_hint(struct regulatory_request *reg_request)
 	if (r == -EALREADY && wiphy &&
 	    wiphy->flags & WIPHY_FLAG_STRICT_REGULATORY)
 		wiphy_update_regulatory(wiphy, initiator);
-out:
-	mutex_unlock(&reg_mutex);
-	mutex_unlock(&cfg80211_mutex);
 }
 
-/* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */
+/*
+ * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
+ * Regulatory hints come on a first come first serve basis and we
+ * must process each one atomically.
+ */
 static void reg_process_pending_hints(void)
-	{
+{
 	struct regulatory_request *reg_request;
 
+	mutex_lock(&cfg80211_mutex);
+	mutex_lock(&reg_mutex);
+
+	/* When last_request->processed becomes true this will be rescheduled */
+	if (last_request && !last_request->processed) {
+		REG_DBG_PRINT("Pending regulatory request, waiting "
+			      "for it to be processed...");
+		goto out;
+	}
+
 	spin_lock(&reg_requests_lock);
-	while (!list_empty(&reg_requests_list)) {
-		reg_request = list_first_entry(&reg_requests_list,
-					       struct regulatory_request,
-					       list);
-		list_del_init(&reg_request->list);
 
+	if (list_empty(&reg_requests_list)) {
 		spin_unlock(&reg_requests_lock);
-		reg_process_hint(reg_request);
-		spin_lock(&reg_requests_lock);
+		goto out;
 	}
+
+	reg_request = list_first_entry(&reg_requests_list,
+				       struct regulatory_request,
+				       list);
+	list_del_init(&reg_request->list);
+
 	spin_unlock(&reg_requests_lock);
+
+	reg_process_hint(reg_request);
+
+out:
+	mutex_unlock(&reg_mutex);
+	mutex_unlock(&cfg80211_mutex);
 }
 
 /* Processes beacon hints -- this has nothing to do with country IEs */
@@ -1494,8 +1531,6 @@ static void reg_todo(struct work_struct *work)
 	reg_process_pending_beacon_hints();
 }
 
-static DECLARE_WORK(reg_work, reg_todo);
-
 static void queue_regulatory_request(struct regulatory_request *request)
 {
 	if (isalpha(request->alpha2[0]))
@@ -1530,12 +1565,7 @@ static int regulatory_hint_core(const char *alpha2)
 	request->alpha2[1] = alpha2[1];
 	request->initiator = NL80211_REGDOM_SET_BY_CORE;
 
-	/*
-	 * This ensures last_request is populated once modules
-	 * come swinging in and calling regulatory hints and
-	 * wiphy_apply_custom_regulatory().
-	 */
-	reg_process_hint(request);
+	queue_regulatory_request(request);
 
 	return 0;
 }
@@ -1823,8 +1853,7 @@ static void print_rd_rules(const struct ieee80211_regdomain *rd)
 	const struct ieee80211_freq_range *freq_range = NULL;
 	const struct ieee80211_power_rule *power_rule = NULL;
 
-	printk(KERN_INFO "    (start_freq - end_freq @ bandwidth), "
-		"(max_antenna_gain, max_eirp)\n");
+	pr_info("    (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
 
 	for (i = 0; i < rd->n_reg_rules; i++) {
 		reg_rule = &rd->reg_rules[i];
@@ -1836,16 +1865,14 @@ static void print_rd_rules(const struct ieee80211_regdomain *rd)
 		 * in certain regions
 		 */
 		if (power_rule->max_antenna_gain)
-			printk(KERN_INFO "    (%d KHz - %d KHz @ %d KHz), "
-				"(%d mBi, %d mBm)\n",
+			pr_info("    (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n",
 				freq_range->start_freq_khz,
 				freq_range->end_freq_khz,
 				freq_range->max_bandwidth_khz,
 				power_rule->max_antenna_gain,
 				power_rule->max_eirp);
 		else
-			printk(KERN_INFO "    (%d KHz - %d KHz @ %d KHz), "
-				"(N/A, %d mBm)\n",
+			pr_info("    (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n",
 				freq_range->start_freq_khz,
 				freq_range->end_freq_khz,
 				freq_range->max_bandwidth_khz,
@@ -1864,27 +1891,20 @@ static void print_regdomain(const struct ieee80211_regdomain *rd)
 			rdev = cfg80211_rdev_by_wiphy_idx(
 				last_request->wiphy_idx);
 			if (rdev) {
-				printk(KERN_INFO "cfg80211: Current regulatory "
-					"domain updated by AP to: %c%c\n",
+				pr_info("Current regulatory domain updated by AP to: %c%c\n",
 					rdev->country_ie_alpha2[0],
 					rdev->country_ie_alpha2[1]);
 			} else
-				printk(KERN_INFO "cfg80211: Current regulatory "
-					"domain intersected:\n");
+				pr_info("Current regulatory domain intersected:\n");
 		} else
-			printk(KERN_INFO "cfg80211: Current regulatory "
-				"domain intersected:\n");
+			pr_info("Current regulatory domain intersected:\n");
 	} else if (is_world_regdom(rd->alpha2))
-		printk(KERN_INFO "cfg80211: World regulatory "
-			"domain updated:\n");
+		pr_info("World regulatory domain updated:\n");
 	else {
 		if (is_unknown_alpha2(rd->alpha2))
-			printk(KERN_INFO "cfg80211: Regulatory domain "
-				"changed to driver built-in settings "
-				"(unknown country)\n");
+			pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
 		else
-			printk(KERN_INFO "cfg80211: Regulatory domain "
-				"changed to country: %c%c\n",
+			pr_info("Regulatory domain changed to country: %c%c\n",
 				rd->alpha2[0], rd->alpha2[1]);
 	}
 	print_rd_rules(rd);
@@ -1892,8 +1912,7 @@ static void print_regdomain(const struct ieee80211_regdomain *rd)
 
 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
 {
-	printk(KERN_INFO "cfg80211: Regulatory domain: %c%c\n",
-		rd->alpha2[0], rd->alpha2[1]);
+	pr_info("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
 	print_rd_rules(rd);
 }
 
@@ -1944,8 +1963,7 @@ static int __set_regdom(const struct ieee80211_regdomain *rd)
 		return -EINVAL;
 
 	if (!is_valid_rd(rd)) {
-		printk(KERN_ERR "cfg80211: Invalid "
-			"regulatory domain detected:\n");
+		pr_err("Invalid regulatory domain detected:\n");
 		print_regdomain_info(rd);
 		return -EINVAL;
 	}
@@ -2061,6 +2079,8 @@ int set_regdom(const struct ieee80211_regdomain *rd)
 
 	nl80211_send_reg_change_event(last_request);
 
+	reg_set_request_processed();
+
 	mutex_unlock(&reg_mutex);
 
 	return r;
@@ -2117,8 +2137,7 @@ int __init regulatory_init(void)
 		 * early boot for call_usermodehelper(). For now treat these
 		 * errors as non-fatal.
 		 */
-		printk(KERN_ERR "cfg80211: kobject_uevent_env() was unable "
-			"to call CRDA during init");
+		pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
 #ifdef CONFIG_CFG80211_REG_DEBUG
 		/* We want to find out exactly why when debugging */
 		WARN_ON(err);