Index: res/res_musiconhold.c
===================================================================
--- res/res_musiconhold.c	(revision 103754)
+++ res/res_musiconhold.c	(working copy)
@@ -992,18 +992,17 @@
 	int x;
 #endif
 	struct mohclass *mohclass = NULL;
+	int res = 0;
 
 	AST_RWLIST_WRLOCK(&mohclasses);
 	if ((mohclass = get_mohbyname(moh->name, 0)) && !moh_diff(mohclass, moh)) {
-		mohclass->delete = 0;
-		if (reload) {
-			ast_debug(1, "Music on Hold class '%s' left alone from initial load.\n", moh->name);
-		} else {
+		if (!mohclass->delete) {
+			mohclass->delete = 0;
 			ast_log(LOG_WARNING, "Music on Hold class '%s' already exists\n", moh->name);
+			ast_free(moh);
+			AST_RWLIST_UNLOCK(&mohclasses);
+			return -1;
 		}
-		ast_free(moh);	
-		AST_RWLIST_UNLOCK(&mohclasses);
-		return -1;
 	}
 	AST_RWLIST_UNLOCK(&mohclasses);
 
@@ -1011,7 +1010,12 @@
 	moh->start -= respawn_time;
 	
 	if (!strcasecmp(moh->mode, "files")) {
-		if (!moh_scan_files(moh)) {
+		res = moh_scan_files(moh);
+		if (res <= 0) {
+			if (res == 0) {
+				if (option_verbose > 2)
+					ast_verbose(VERBOSE_PREFIX_3 "Files not found in %s for moh class:%s\n", moh->dir, moh->name);
+			}
 			ast_moh_free_class(&moh);
 			return -1;
 		}
@@ -1404,7 +1408,6 @@
 
 			/* Don't leak a class when it's already registered */
 			moh_register(class, reload);
-
 			numclasses++;
 		}
 	}
@@ -1568,14 +1571,6 @@
 			AST_RWLIST_REMOVE_CURRENT(list);
 			if (!moh->inuse)
 				ast_moh_destroy_one(moh);
-		} else if (moh->total_files) {
-			if (moh_scan_files(moh) <= 0) {
-				ast_log(LOG_WARNING, "No files found for class '%s'\n", moh->name);
-				moh->delete = 1;
-				AST_LIST_REMOVE_CURRENT(list);
-				if (!moh->inuse)
-					ast_moh_destroy_one(moh);
-			}
 		}
 	}
 	AST_RWLIST_TRAVERSE_SAFE_END
@@ -1619,7 +1614,31 @@
 
 static int unload_module(void)
 {
-	return -1;
+	int res = 0;
+	struct mohclass *class = NULL;
+
+	AST_RWLIST_WRLOCK(&mohclasses);
+	AST_LIST_TRAVERSE(&mohclasses, class, list) {
+		if (class->inuse > 0) {
+			res = -1;
+			break;
+		}
+	}
+	AST_RWLIST_UNLOCK(&mohclasses);
+	if (res < 0) {
+		ast_log(LOG_WARNING, "Unable to unload res_musiconhold due to active MOH channels\n");
+		return res;
+	}
+
+	ast_uninstall_music_functions();
+	ast_moh_destroy();
+	res = ast_unregister_application(play_moh);
+	res |= ast_unregister_application(wait_moh);
+	res |= ast_unregister_application(set_moh);
+	res |= ast_unregister_application(start_moh);
+	res |= ast_unregister_application(stop_moh);
+	ast_cli_unregister_multiple(cli_moh, sizeof(cli_moh) / sizeof(struct ast_cli_entry));
+	return res;
 }
 
 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Music On Hold Resource",