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[ Upstream commit77c3c95637] unlocked version of protocol level close, will be used by MPTCP to allow decouple orphaning and subflow level close. Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Stable-dep-of:e14cadfd80("tcp: add annotations around sk->sk_shutdown accesses") Signed-off-by: Sasha Levin <sashal@kernel.org>