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由 Eric Dumazet 提交于
While timer handler effectively runs a rcu read locked section, there is no explicit rcu_read_lock()/rcu_read_unlock() annotations and lockdep can be confused here : net/ipv4/tcp_ipv4.c-906- /* caller either holds rcu_read_lock() or socket lock */ net/ipv4/tcp_ipv4.c:907: md5sig = rcu_dereference_check(tp->md5sig_info, net/ipv4/tcp_ipv4.c-908- sock_owned_by_user(sk) || net/ipv4/tcp_ipv4.c-909- lockdep_is_held(&sk->sk_lock.slock)); Let's explicitely acquire rcu_read_lock() in tcp_make_synack() Before commit fa76ce73 ("inet: get rid of central tcp/dccp listener timer"), we were holding listener lock so lockdep was happy. Fixes: fa76ce73 ("inet: get rid of central tcp/dccp listener timer") Signed-off-by: NEric DUmazet <edumazet@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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