cvs commit: src/sys/net if_atmsubr.c

[Robert Watson]

rwatson     2005-08-24 18:10:51 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_6)
    sys/net              if_atmsubr.c 
  Log:
  Merge if_atmsubr.c:1.38 from HEAD to RELENG_6:
  
    Lock down netnatm and mark as MPSAFE:
  
    - Introduce a subsystem mutex, natm_mtx, manipulated with accessor macros
      NATM_LOCK_INIT(), NATM_LOCK(), NATM_UNLOCK(), NATM_LOCK_ASSERT().  It
      protects the consistency of pcb-related data structures.  Finer grained
      locking is possible, but should be done in the context of specific
      measurements (as very little work is done in netnatm -- most is in the
      ATM device driver or socket layer, so there's probably not much
      contention).
  
    - Remove GIANT_REQUIRED, mark as NETISR_MPSAFE, remove
      NET_NEEDS_GIANT("netnatm").
  
    - Conditionally acquire Giant when entering network interfaces for
      ifp->if_ioctl() using IFF_LOCKGIANT(ifp)/IFF_UNLOCKGIANT(ifp) in order
      to coexist with non-MPSAFE atm ifnet drivers..
  
    - De-spl.
  
    Reviewed by:    harti, bms (various versions)
  
  Approved by:    re (hrs)
  
  Revision  Changes    Path
  1.37.2.2  +9 -6      src/sys/net/if_atmsubr.c