From owner-cvs-all  Wed Feb 21 18:18:36 2001
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From: John Baldwin <jhb@FreeBSD.org>
Date: Wed, 21 Feb 2001 18:18:33 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/kern kern_intr.c src/sys/sys interrupt.h
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jhb         2001/02/21 18:18:33 PST

  Modified files:
    sys/kern             kern_intr.c 
    sys/sys              interrupt.h 
  Log:
  Work around a race condition where an interrupt handler can be removed from
  an interrupt thread while the interrupt thread is blocked on Giant waiting
  to execute the interrupt handler being removed.  The result was that the
  intrhand structure would be free'd, and we would call 0xdeadc0de.  The work
  around is to check to see if the interrupt thread is idle when removing a
  handler.  If not, then we mark the interrupt handler as being dead using
  the new IH_DEAD flag and don't remove it from the interrupt threads' list
  of handlers.  When the interrupt thread resumes, it will see a dead handler
  while traversing the list of handlers and will remove the handler then.
  
  Revision  Changes    Path
  1.46      +35 -4     src/sys/kern/kern_intr.c
  1.15      +2 -1      src/sys/sys/interrupt.h


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