[PATCH 4.14 101/146] tcp: fix potential underestimation on rcv_rtt

4.14-stable review patch. If anyone has any objections, please let me know. -- From: Wei Wang [ Upstream commit 9ee11bd03cb1a5c3ca33c2bb70e7ed325f68890f ] When ms timestamp is used, current logic uses 1us in tcp_rcv_rtt_update() when the real rcv_rtt is

[PATCH 4.14 101/146] tcp: fix potential underestimation on rcv_rtt

4.14-stable review patch. If anyone has any objections, please let me know. -- From: Wei Wang [ Upstream commit 9ee11bd03cb1a5c3ca33c2bb70e7ed325f68890f ] When ms timestamp is used, current logic uses 1us in tcp_rcv_rtt_update() when the real rcv_rtt is within 1 - 999us.