From 777020839a1ba68ea5bd77a5b17648f4b831caf7 Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Thu, 5 Feb 2015 10:42:09 +0100
Subject: [PATCH] dict.c: prevent useless resize to same size.

Related to issue #2306.
---
 src/dict.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/dict.c b/src/dict.c
index a1475772..26707dd5 100644
--- a/src/dict.c
+++ b/src/dict.c
@@ -211,6 +211,9 @@ int dictExpand(dict *d, unsigned long size)
     if (dictIsRehashing(d) || d->ht[0].used > size)
         return DICT_ERR;
 
+    /* Rehashing to the same table size is not useful. */
+    if (realsize == d->ht[0].size) return DICT_ERR;
+
     /* Allocate the new hash table and initialize all pointers to NULL */
     n.size = realsize;
     n.sizemask = realsize-1;