src: const annotate the bluetooth plugin API

The data was never mutable, so there's no API/ABI breakage here.

src/genbuiltin

@@ -2,11 +2,11 @@
 
 for i in $*
 do
-	echo "extern struct bluetooth_plugin_desc __bluetooth_builtin_$i;"
+	echo "extern const struct bluetooth_plugin_desc __bluetooth_builtin_$i;"
 done
 
 echo
-echo "static struct bluetooth_plugin_desc *__bluetooth_builtin[] = {"
+echo "static const struct bluetooth_plugin_desc *__bluetooth_builtin[] = {"
 
 for i in $*
 do

src/log.c

@@ -123,7 +123,7 @@ extern struct btd_debug_desc __stop___debug[];
 
 static char **enabled = NULL;
 
-static gboolean is_enabled(struct btd_debug_desc *desc)
+static gboolean is_enabled(const struct btd_debug_desc *desc)
 {
 	int i;
 

src/plugin.c

@@ -31,7 +31,7 @@ static GSList *plugins = NULL;
 struct bluetooth_plugin {
 	void *handle;
 	gboolean active;
-	struct bluetooth_plugin_desc *desc;
+	const struct bluetooth_plugin_desc *desc;
 };
 
 static int compare_priority(gconstpointer a, gconstpointer b)
@@ -42,7 +42,8 @@ static int compare_priority(gconstpointer a, gconstpointer b)
 	return plugin2->desc->priority - plugin1->desc->priority;
 }
 
-static gboolean add_plugin(void *handle, struct bluetooth_plugin_desc *desc)
+static gboolean add_plugin(void *handle,
+				const struct bluetooth_plugin_desc *desc)
 {
 	struct bluetooth_plugin *plugin;
 
@@ -141,7 +142,7 @@ gboolean plugin_init(const char *enable, const char *disable)
 		goto start;
 
 	while ((file = g_dir_read_name(dir)) != NULL) {
-		struct bluetooth_plugin_desc *desc;
+		const struct bluetooth_plugin_desc *desc;
 		void *handle;
 		char *filename;
 

src/plugin.h

@@ -23,7 +23,8 @@ struct bluetooth_plugin_desc {
 
 #ifdef BLUETOOTH_PLUGIN_BUILTIN
 #define BLUETOOTH_PLUGIN_DEFINE(name, version, priority, init, exit) \
-		struct bluetooth_plugin_desc __bluetooth_builtin_ ## name = { \
+		const struct bluetooth_plugin_desc \
+		__bluetooth_builtin_ ## name = { \
 			#name, version, priority, init, exit \
 		};
 #else
@@ -32,9 +33,10 @@ struct bluetooth_plugin_desc {
 				__attribute__ ((weak, visibility("hidden"))); \
 		extern struct btd_debug_desc __stop___debug[] \
 				__attribute__ ((weak, visibility("hidden"))); \
-		extern struct bluetooth_plugin_desc bluetooth_plugin_desc \
+		extern const struct bluetooth_plugin_desc \
+				bluetooth_plugin_desc \
 				__attribute__ ((visibility("default"))); \
-		struct bluetooth_plugin_desc bluetooth_plugin_desc = { \
+		const struct bluetooth_plugin_desc bluetooth_plugin_desc = { \
 			#name, version, priority, init, exit, \
 			__start___debug, __stop___debug \
 		};