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From: Robert Watson <rwatson@FreeBSD.org>
Date: Fri, 28 Aug 2009 20:07:38 +0000 (UTC)
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X-FreeBSD-CVS-Branch: RELENG_8
Subject: cvs commit: src/sys/net if_ef.c
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rwatson     2009-08-28 20:07:38 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_8)
    sys/net              if_ef.c 
  Log:
  SVN rev 196627 on 2009-08-28 20:07:38Z by rwatson
  
  Merge r196482 from head to stable/8:
  
    Rather than using IFNET_RLOCK() when iterating over (and modifying) the
    ifnet list during if_ef load, directly acquire the ifnet_sxlock
    exclusively.  That way when if_alloc() recurses the lock, it's a write
    recursion rather than a read->write recursion.
  
    This code structure is arguably a bug, so add a comment indicating that
    this is the case.  Post-8.0, we should fix this, but this commit
    resolves panic-on-load for if_ef.
  
    Discussed with:       bz, julian
    Reported by:  phk
  
  Approved by:    re (kib)
  
  Revision  Changes    Path
  1.49.2.2  +15 -2     src/sys/net/if_ef.c