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From: Robert Watson <rwatson@FreeBSD.org>
Date: Mon, 5 Oct 2009 22:24:13 +0000 (UTC)
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Subject: cvs commit: src/sys/netinet tcp_input.c
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rwatson     2009-10-05 22:24:13 UTC

  FreeBSD src repository

  Modified files:
    sys/netinet          tcp_input.c 
  Log:
  SVN rev 197795 on 2009-10-05 22:24:13Z by rwatson
  
  In tcp_input(), we acquire a global write lock at first only if a
  segment is likely to trigger a TCP state change (i.e., FIN/RST/SYN).
  If we later have to upgrade the lock, we acquire an inpcb reference
  and drop both global/inpcb locks before reacquiring in-order.  In
  that gap, the connection may transition into TIMEWAIT, so we need
  to loop back and reevaluate the inpcb after relocking.
  
  MFC after:      3 days
  Reported by:    Kamigishi Rei <spambox at haruhiism.net>
  Reviewed by:    bz
  
  Revision  Changes    Path
  1.412     +4 -1      src/sys/netinet/tcp_input.c