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We forgot to send up SCTP_SENDER_DRY_EVENT notification when user app subscribes to this event, and there is no data to be sent or retransmit. This is required by the Socket API and used by the DTLS/SCTP implementation. Reported-by: Michael Tüxen <Michael.Tuexen@lurchi.franken.de> Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com> Tested-by: Robin Seggelmann <seggelmann@fh-muenster.de> Signed-off-by: David S. Miller <davem@davemloft.net>