From 0aec09d049d7e994eba54bad4376dd8f58eab797 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 7 Aug 2014 07:32:06 -0400
Subject: [PATCH] drop ->s_umount around acct_auto_close()

just repeat the frozen check after regaining it, and check that sb
is still alive.  If several threads hit acct_auto_close() at the
same time, acct_auto_close() will survive that just fine.  And we
really don't want to play with writes and closing the file with
->s_umount held exclusive - it's a deadlock country.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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