tree c95cf3b428f797e0ee75defbe31dfabf6c6957bb
parent e2f8d555ec04a0beb965ea76e3a150993e8f0436
author Eric Dumazet <edumazet@google.com> 1361519015 +0000
committer David S. Miller <davem@davemloft.net> 1361563819 -0500

net: fix possible deadlock in sum_frag_mem_limit

Dave Jones reported a lockdep splat occurring in IP defrag code.

commit 6d7b857d541ecd1d (net: use lib/percpu_counter API for
fragmentation mem accounting) added a possible deadlock.

Because percpu_counter_sum_positive() needs to acquire
a lock that can be used from softirq, we need to disable BH
in sum_frag_mem_limit()

Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>