On Wed, 2013-03-27 at 16:55 +0100, Jesper Dangaard Brouer wrote:

The LRU list is protected by its own lock, since commit 3ef0eb0db4
(net: frag, move LRU list maintenance outside of rwlock), and
no-longer by a read_lock.

This makes it possible, to remove the inet_frag_queue, which is about
to be "evicted", from the LRU list head.  This avoids the problem, of
several CPUs grabbing the same frag queue.

Note, cannot remove the inet_frag_lru_del() call in fq_unlink()
called by inet_frag_kill(), because inet_frag_kill() is also used in
other situations.  Thus, we use list_del_init() to allow this
double list_del to work.

Signed-off-by: Jesper Dangaard Brouer <redacted>
---

 net/ipv4/inet_fragment.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

Acked-by: Eric Dumazet <edumazet@google.com>