From: NeilBrown <neilb@suse.de>
Date: Wed, 6 Feb 2008 09:39:55 +0000 (-0800)
Subject: md: lock address when changing attributes of component devices
X-Git-Tag: v2.6.25-rc1~549
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ca38805945edf5d1f5444b283eed95bb954772e8;p=linux-2.6

md: lock address when changing attributes of component devices

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 7c9a87b02e..39757566f3 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2075,12 +2075,18 @@ rdev_attr_store(struct kobject *kobj, struct attribute *attr,
 {
 	struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
 	mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
+	int rv;
 
 	if (!entry->store)
 		return -EIO;
 	if (!capable(CAP_SYS_ADMIN))
 		return -EACCES;
-	return entry->store(rdev, page, length);
+	rv = mddev_lock(rdev->mddev);
+	if (!rv) {
+		rv = entry->store(rdev, page, length);
+		mddev_unlock(rdev->mddev);
+	}
+	return rv;
 }
 
 static void rdev_free(struct kobject *ko)