1 files changed, 17 insertions, 6 deletions

diff --git a/block/elevator.c b/block/elevator.c
index 77856bf29568..7bda083d5968 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -83,6 +83,16 @@ bool elv_bio_merge_ok(struct request *rq, struct bio *bio)
 }
 EXPORT_SYMBOL(elv_bio_merge_ok);
 
+static bool elevator_match(const struct elevator_type *e, const char *name)
+{
+        if (!strcmp(e->elevator_name, name))
+                return true;
+        if (e->elevator_alias && !strcmp(e->elevator_alias, name))
+                return true;
+
+        return false;
+}
+
 /*
  * Return scheduler with name 'name' and with matching 'mq capability
  */
@@ -91,7 +101,7 @@ static struct elevator_type *elevator_find(const char *name, bool mq)
         struct elevator_type *e;
 
         list_for_each_entry(e, &elv_list, list) {
-                if (!strcmp(e->elevator_name, name) && (mq == e->uses_mq))
+                if (elevator_match(e, name) && (mq == e->uses_mq))
                         return e;
         }
 
@@ -922,9 +932,9 @@ int elv_register(struct elevator_type *e)
         spin_unlock(&elv_list_lock);
 
         /* print pretty message */
-        if (!strcmp(e->elevator_name, chosen_elevator) ||
+        if (elevator_match(e, chosen_elevator) ||
                         (!*chosen_elevator &&
-                         !strcmp(e->elevator_name, CONFIG_DEFAULT_IOSCHED)))
+                         elevator_match(e, CONFIG_DEFAULT_IOSCHED)))
                                 def = " (default)";
 
         printk(KERN_INFO "io scheduler %s registered%s\n", e->elevator_name,
@@ -1077,8 +1087,7 @@ static int __elevator_change(struct request_queue *q, const char *name)
         if (!e)
                 return -EINVAL;
 
-        if (q->elevator &&
-            !strcmp(elevator_name, q->elevator->type->elevator_name)) {
+        if (q->elevator && elevator_match(q->elevator->type, elevator_name)) {
                 elevator_put(e);
                 return 0;
         }
@@ -1114,6 +1123,7 @@ ssize_t elv_iosched_show(struct request_queue *q, char *name)
         struct elevator_queue *e = q->elevator;
         struct elevator_type *elv = NULL;
         struct elevator_type *__e;
+        bool uses_mq = q->mq_ops != NULL;
         int len = 0;
 
         if (!queue_is_rq_based(q))
@@ -1126,7 +1136,8 @@ ssize_t elv_iosched_show(struct request_queue *q, char *name)
 
         spin_lock(&elv_list_lock);
         list_for_each_entry(__e, &elv_list, list) {
-                if (elv && !strcmp(elv->elevator_name, __e->elevator_name)) {
+                if (elv && elevator_match(elv, __e->elevator_name) &&
+                    (__e->uses_mq == uses_mq)) {
                         len += sprintf(name+len, "[%s] ", elv->elevator_name);
                         continue;
                 }