From: NeilBrown <neilb@suse.de>
Date: Mon, 15 Dec 2014 01:56:58 +0000 (+1100)
Subject: md: protect ->pers changes with mddev->lock
X-Git-Tag: fixes-v4.0-rc1~120^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=36d091f4759d194c99f0705d412afe208622b45a;p=pandora-kernel.git

md: protect ->pers changes with mddev->lock

->pers is already protected by ->reconfig_mutex, and
cannot possibly change when there are threads running or
outstanding IO.

However there are some places where we access ->pers
not in a thread or IO context, and where ->reconfig_mutex
is unnecessarily heavy-weight:  level_show and md_seq_show().

So protect all changes, and those accesses, with ->lock.
This is a step toward taking those accesses out from under
reconfig_mutex.

[Fixed missing "mddev->pers" -> "pers" conversion, thanks to
 Dan Carpenter <dan.carpenter@oracle.com>]

Signed-off-by: NeilBrown <neilb@suse.de>
---

Reading git-diff-tree failed