diff --git a/arch/sh/mm/pmb.c b/arch/sh/mm/pmb.c
index 18623ba751b32e3863094bae05bcf44d58141f4b..6379091a164764040c57fce64b9a9dae521bff41 100644
--- a/arch/sh/mm/pmb.c
+++ b/arch/sh/mm/pmb.c
@@ -770,7 +770,7 @@ static void __init pmb_resize(void)
 		spin_unlock_irqrestore(&pmbe->lock, flags);
 	}
 
-	read_lock(&pmb_rwlock);
+	read_unlock(&pmb_rwlock);
 }
 #endif