e820: fix e820_change_range_type()

In below case, e820_change_range_type() will return success:
[s, e] is in the middle of [rs, re] and e820->nr_map+1 >=
ARRAY_SIZE(e820->map) actually, it's failed, so this patch fix it

Signed-off-by: Xiao Guangrong <ericxiao.gr@gmail.com>

diff --git a/xen/arch/x86/e820.c b/xen/arch/x86/e820.c
index 5dfb3f3c41b8990d5e7efe7fc51e58235b177d28..eac051fad8051df44dd7a243ad107926f3a83d7c 100644 (file)
--- a/xen/arch/x86/e820.c
+++ b/xen/arch/x86/e820.c
@@ -574,7 +574,7 @@ int __init e820_change_range_type(
             e820->map[i+1].type = new_type;
         }
     }
-    else if ( e820->nr_map+1 < ARRAY_SIZE(e820->map) )
+    else
     {
         if ( (e820->nr_map + 2) > ARRAY_SIZE(e820->map) )
             goto overflow;