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>

1 files changed, 1 insertions, 1 deletions

diff --git a/util.c b/util.c
index 75a5e6d..52171cc 100644
--- a/util.c
+++ b/util.c
@@ -994,7 +994,7 @@ 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)