net: fix possible deadlock in sum_frag_mem_limit
Dave Jones reported a lockdep splat occurring in IP defrag code.
commit 6d7b857d54
(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>
This commit is contained in:
parent
e2f8d555ec
commit
4cfb04854d
|
@ -114,7 +114,13 @@ static inline void init_frag_mem_limit(struct netns_frags *nf)
|
|||
|
||||
static inline int sum_frag_mem_limit(struct netns_frags *nf)
|
||||
{
|
||||
return percpu_counter_sum_positive(&nf->mem);
|
||||
int res;
|
||||
|
||||
local_bh_disable();
|
||||
res = percpu_counter_sum_positive(&nf->mem);
|
||||
local_bh_enable();
|
||||
|
||||
return res;
|
||||
}
|
||||
|
||||
static inline void inet_frag_lru_move(struct inet_frag_queue *q)
|
||||
|
|
Loading…
Reference in a new issue