From: Theodore Ts'o <tytso@mit.edu>
Date: Tue, 2 Jun 2009 12:09:29 +0000 (-0400)
Subject: ext4: fix locking typo in mballoc which could cause soft lockup hangs
X-Git-Tag: v2.6.27.25~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e025f408e6c036ce2447096c2bf8a2046c106ed3;p=pandora-kernel.git

ext4: fix locking typo in mballoc which could cause soft lockup hangs

upstream commit: e7c9e3e99adf6c49c5d593a51375916acc039d1e

Smatch (http://repo.or.cz/w/smatch.git/) complains about the locking in
ext4_mb_add_n_trim() from fs/ext4/mballoc.c

  4438          list_for_each_entry_rcu(tmp_pa, &lg->lg_prealloc_list[order],
  4439                                                  pa_inode_list) {
  4440                  spin_lock(&tmp_pa->pa_lock);
  4441                  if (tmp_pa->pa_deleted) {
  4442                          spin_unlock(&pa->pa_lock);
  4443                          continue;
  4444                  }

Brown paper bag time...

Reported-by: Dan Carpenter <error27@gmail.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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