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authorEric Dumazet <eric.dumazet@gmail.com>2012-07-31 01:08:23 +0000
committerDavid S. Miller <davem@davemloft.net>2012-07-31 14:41:38 -0700
commit54764bb647b2e847c512acf8d443df965da35000 (patch)
tree3918f6f42679d0ebdcef230f28285f99d178be62 /net/caif
parent5a0d513b622ee41e117fc37e26e27e8ef42e8dae (diff)
downloadop-kernel-dev-54764bb647b2e847c512acf8d443df965da35000.zip
op-kernel-dev-54764bb647b2e847c512acf8d443df965da35000.tar.gz
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>
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