4 files changed, 81 insertions, 20 deletions

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 95832ce03a44..f882fe1f9709 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -990,6 +990,8 @@
  *	&NL80211_CMD_CONNECT or &NL80211_CMD_ROAM. If the 4 way handshake failed
  *	&NL80211_CMD_DISCONNECT should be indicated instead.
  *
+ * @NL80211_CMD_RELOAD_REGDB: Request that the regdb firmware file is reloaded.
+ *
  * @NL80211_CMD_MAX: highest used command number
  * @__NL80211_CMD_AFTER_LAST: internal use
  */
@@ -1194,6 +1196,8 @@ enum nl80211_commands {
 
 	NL80211_CMD_PORT_AUTHORIZED,
 
+	NL80211_CMD_RELOAD_REGDB,
+
 	/* add new commands above here */
 
 	/* used to define NL80211_CMD_MAX below */
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 5129342151e6..67a03f2885a4 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -5678,6 +5678,11 @@ static int nl80211_req_set_reg(struct sk_buff *skb, struct genl_info *info)
 	}
 }
 
+static int nl80211_reload_regdb(struct sk_buff *skb, struct genl_info *info)
+{
+	return reg_reload_regdb();
+}
+
 static int nl80211_get_mesh_config(struct sk_buff *skb,
 				   struct genl_info *info)
 {
@@ -12709,6 +12714,12 @@ static const struct genl_ops nl80211_ops[] = {
 		.flags = GENL_ADMIN_PERM,
 	},
 	{
+		.cmd = NL80211_CMD_RELOAD_REGDB,
+		.doit = nl80211_reload_regdb,
+		.policy = nl80211_policy,
+		.flags = GENL_ADMIN_PERM,
+	},
+	{
 		.cmd = NL80211_CMD_GET_MESH_CONFIG,
 		.doit = nl80211_get_mesh_config,
 		.policy = nl80211_policy,
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index e9aeb05aaf3e..180addda52af 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -781,6 +781,8 @@ static int query_regdb(const char *alpha2)
 	const struct fwdb_header *hdr = regdb;
 	const struct fwdb_country *country;
 
+	ASSERT_RTNL();
+
 	if (IS_ERR(regdb))
 		return PTR_ERR(regdb);
 
@@ -796,41 +798,47 @@ static int query_regdb(const char *alpha2)
 
 static void regdb_fw_cb(const struct firmware *fw, void *context)
 {
+	int set_error = 0;
+	bool restore = true;
 	void *db;
 
 	if (!fw) {
 		pr_info("failed to load regulatory.db\n");
-		regdb = ERR_PTR(-ENODATA);
-		goto restore;
-	}
-
-	if (!valid_regdb(fw->data, fw->size)) {
+		set_error = -ENODATA;
+	} else if (!valid_regdb(fw->data, fw->size)) {
 		pr_info("loaded regulatory.db is malformed\n");
-		release_firmware(fw);
-		regdb = ERR_PTR(-EINVAL);
-		goto restore;
+		set_error = -EINVAL;
 	}
 
-	db = kmemdup(fw->data, fw->size, GFP_KERNEL);
-	release_firmware(fw);
+	rtnl_lock();
+	if (WARN_ON(regdb && !IS_ERR(regdb))) {
+		/* just restore and free new db */
+	} else if (set_error) {
+		regdb = ERR_PTR(set_error);
+	} else if (fw) {
+		db = kmemdup(fw->data, fw->size, GFP_KERNEL);
+		if (db) {
+			regdb = db;
+			restore = context && query_regdb(context);
+		} else {
+			restore = true;
+		}
+	}
 
-	if (!db)
-		goto restore;
-	regdb = db;
+	if (restore)
+		restore_regulatory_settings(true);
 
-	if (query_regdb(context))
-		goto restore;
-	goto free;
- restore:
-	rtnl_lock();
-	restore_regulatory_settings(true);
 	rtnl_unlock();
- free:
+
 	kfree(context);
+
+	release_firmware(fw);
 }
 
 static int query_regdb_file(const char *alpha2)
 {
+	ASSERT_RTNL();
+
 	if (regdb)
 		return query_regdb(alpha2);
 
@@ -843,6 +851,38 @@ static int query_regdb_file(const char *alpha2)
 				       (void *)alpha2, regdb_fw_cb);
 }
 
+int reg_reload_regdb(void)
+{
+	const struct firmware *fw;
+	void *db;
+	int err;
+
+	err = request_firmware(&fw, "regulatory.db", &reg_pdev->dev);
+	if (err)
+		return err;
+
+	if (!valid_regdb(fw->data, fw->size)) {
+		err = -ENODATA;
+		goto out;
+	}
+
+	db = kmemdup(fw->data, fw->size, GFP_KERNEL);
+	if (!db) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	rtnl_lock();
+	if (!IS_ERR_OR_NULL(regdb))
+		kfree(regdb);
+	regdb = db;
+	rtnl_unlock();
+
+ out:
+	release_firmware(fw);
+	return err;
+}
+
 static bool reg_query_database(struct regulatory_request *request)
 {
 	/* query internal regulatory database (if it exists) */
diff --git a/net/wireless/reg.h b/net/wireless/reg.h
index ca7fedf2e7a1..9529c522611a 100644
--- a/net/wireless/reg.h
+++ b/net/wireless/reg.h
@@ -179,4 +179,10 @@ void regulatory_propagate_dfs_state(struct wiphy *wiphy,
  * @wiphy2 - wiphy it's dfs_region to be checked against that of wiphy1
  */
 bool reg_dfs_domain_same(struct wiphy *wiphy1, struct wiphy *wiphy2);
+
+/**
+ * reg_reload_regdb - reload the regulatory.db firmware file
+ */
+int reg_reload_regdb(void);
+
 #endif  /* __NET_WIRELESS_REG_H */