From 82a7851e5f5575991967d953c33116f6f2d60072 Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Thu, 10 Mar 2011 11:41:21 +1100
Subject: [PATCH] dev_open should always open read-only.

When opening an array to manipulate it we never need to write to the
array and  sometimes it might be read-only so the open for write will
fail.
So always open read-only.

Reported-by: Adam Kwolek <adam.kwolek@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
---
 util.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/util.c b/util.c
index 87c23dc..c22bb3b 100644
--- a/util.c
+++ b/util.c
@@ -1003,7 +1003,7 @@ int open_dev(int devnum)
 	char buf[20];
 
 	sprintf(buf, "%d:%d", dev2major(devnum), dev2minor(devnum));
-	return dev_open(buf, O_RDWR);
+	return dev_open(buf, O_RDONLY);
 }
 
 int open_dev_excl(int devnum)