Merged revisions 377911 via svnmerge from

file:///srv/subversion/repos/asterisk/trunk

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  r377911 | mmichelson | 2012-12-11 18:02:31 -0600 (Tue, 11 Dec 2012) | 22 lines
  
  Fix a potential deadlock in chan_sip during transfers.
  
  The issue comes from the fact that transfers may perform
  a redirecting update on a channel. The issue is that lock
  inversion between the channel and its tech_pvt occurs since
  the channel lock is released during the transfer process.
  
  The fix is to move when the redirecting update occurs to a
  place where neither the tech_pvt or the channel is locked so
  that the two can be locked in the proper order.
  
  (closes issue ASTERISK-20708)
  reported by Mark Michelson
  patches:
  	ASTERISK-20708-3.patch uploaded by Mark Michelson (License #5049)
  
  Tested by:
  	Tim Ringenbach at Asteria Solutions Group
  ........
  
  Merged revisions 377910 from http://svn.asterisk.org/svn/asterisk/branches/11
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git-svn-id: https://origsvn.digium.com/svn/asterisk/team/mmichelson/threadpool@377912 65c4cc65-6c06-0410-ace0-fbb531ad65f3