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From: Randall Stewart <rrs@FreeBSD.org>
Date: Thu, 12 Feb 2009 17:31:39 +0000 (UTC)
To: cvs-src-old@freebsd.org
X-FreeBSD-CVS-Branch: RELENG_7
Subject: cvs commit: src/sys/netinet sctp_output.c
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rrs         2009-02-12 17:31:39 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_7)
    sys/netinet          sctp_output.c 
  Log:
  SVN rev 188523 on 2009-02-12 17:31:39Z by rrs
  
  MFC of 184336:
  
  Two inter-related bugs.
    - If we send EXACTLY the size left in the send buffer
      and then send again, we end up with exactly 0 bytes and
      don't hit the pre-block code to wait for more space.
    - If we fall into the loop with our max_len == 0 (the bug
      above) we then call in to copy out the data, setup the length
      of the waiting to transmit data to 0 and call the mbuf copy routine
      which 0 indicates copy all the data to the mbuf chain.. which it
      does. This then leaves a "stuck" message on the stream queue with
      its size exactly 0 bytes but all the data there and thus nothing
      left in the uio structure. We then reach a stuck forever state
      never being able to send data.
  
  Revision   Changes    Path
  1.58.2.13  +8 -2      src/sys/netinet/sctp_output.c