If path selector name unrecognised, attempt to load module with that name.
--- diff/drivers/md/dm-path-selector.c	2004-09-28 18:06:33.000000000 +0100
+++ source/drivers/md/dm-path-selector.c	2004-09-28 18:06:20.000000000 +0100
@@ -25,38 +25,49 @@
 static LIST_HEAD(_path_selectors);
 static DECLARE_RWSEM(_lock);
 
-struct path_selector_type *__find_path_selector_type(const char *name)
+struct ps_internal *__find_path_selector_type(const char *name)
 {
 	struct ps_internal *psi;
 
 	list_for_each_entry (psi, &_path_selectors, list) {
 		if (!strcmp(name, psi->pst.name))
-			return &psi->pst;
+			return psi;
 	}
 
 	return NULL;
 }
 
-struct path_selector_type *dm_get_path_selector(const char *name)
+static struct ps_internal *get_path_selector(const char *name)
 {
-	struct path_selector_type *pst;
-
-	if (!name)
-		return NULL;
+	struct ps_internal *psi;
 
 	down_read(&_lock);
-	pst = __find_path_selector_type(name);
-	if (pst) {
-		struct ps_internal *psi = pst_to_psi(pst);
-
-		if ((psi->use == 0) && !try_module_get(pst->module))
+	psi = __find_path_selector_type(name);
+	if (psi) {
+		if ((psi->use == 0) && !try_module_get(psi->pst.module))
 			psi = NULL;
 		else
 			psi->use++;
 	}
 	up_read(&_lock);
 
-	return pst;
+	return psi;
+}
+
+struct path_selector_type *dm_get_path_selector(const char *name)
+{
+	struct ps_internal *psi;
+
+	if (!name)
+		return NULL;
+
+	psi = get_path_selector(name);
+	if (!psi) {
+		request_module("dm-%s", name);
+		psi = get_path_selector(name);
+	}
+
+	return psi ? &psi->pst : NULL;
 }
 
 void dm_put_path_selector(struct path_selector_type *pst)
@@ -64,11 +75,10 @@
 	struct ps_internal *psi;
 
 	down_read(&_lock);
-	pst = __find_path_selector_type(pst->name);
-	if (!pst)
+	psi = __find_path_selector_type(pst->name);
+	if (!psi)
 		return;
 
-	psi = pst_to_psi(pst);
 	if (--psi->use == 0)
 		module_put(psi->pst.module);
 
@@ -115,13 +125,12 @@
 	struct ps_internal *psi;
 
 	down_write(&_lock);
-	pst = __find_path_selector_type(pst->name);
-	if (!pst) {
+	psi = __find_path_selector_type(pst->name);
+	if (!psi) {
 		up_write(&_lock);
 		return -EINVAL;
 	}
 
-	psi = pst_to_psi(pst);
 	if (psi->use) {
 		up_write(&_lock);
 		return -ETXTBSY;