linux

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History

Eric Dumazet 54764bb647 ipv4: Restore old dst_free() behavior.

commit 404e0a8b6a55 (net: ipv4: fix RCU races on dst refcounts) tried
to solve a race but added a problem at device/fib dismantle time :

We really want to call dst_free() as soon as possible, even if sockets
still have dst in their cache.
dst_release() calls in free_fib_info_rcu() are not welcomed.

Root of the problem was that now we also cache output routes (in
nh_rth_output), we must use call_rcu() instead of call_rcu_bh() in
rt_free(), because output route lookups are done in process context.

Based on feedback and initial patch from David Miller (adding another
call_rcu_bh() call in fib, but it appears it was not the right fix)

I left the inet_sk_rx_dst_set() helper and added __rcu attributes
to nh_rth_output and nh_rth_input to better document what is going on in
this code.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2012-07-31 14:41:38 -07:00

datagram.c

net: skb_free_datagram_locked() doesnt drop all packets

2012-06-27 15:40:57 -07:00

dev_addr_lists.c

…

dev.c

net: Make skb->skb_iif always track skb->dev

2012-07-23 16:36:27 -07:00

drop_monitor.c

drop_monitor: dont sleep in atomic context

2012-06-04 11:42:01 -04:00