From f1167009711032b0d747ec89a632a626c901a1ad Mon Sep 17 00:00:00 2001
From: Niu Yawei <yawei.niu@gmail.com>
Date: Fri, 1 Feb 2013 21:31:27 -0500
Subject: [PATCH] ext4: fix race in ext4_mb_add_n_trim()

In ext4_mb_add_n_trim(), lg_prealloc_lock should be taken when
changing the lg_prealloc_list.

Signed-off-by: Niu Yawei <yawei.niu@intel.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@vger.kernel.org
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