From owner-cvs-src-old@FreeBSD.ORG  Thu Dec 23 15:17:38 2010
Return-Path: <owner-cvs-src-old@FreeBSD.ORG>
Delivered-To: cvs-src-old@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id D890410656AE
	for <cvs-src-old@freebsd.org>; Thu, 23 Dec 2010 15:17:38 +0000 (UTC)
	(envelope-from jhb@FreeBSD.org)
Received: from repoman.freebsd.org (repoman.freebsd.org
	[IPv6:2001:4f8:fff6::29])
	by mx1.freebsd.org (Postfix) with ESMTP id C77E68FC12
	for <cvs-src-old@freebsd.org>; Thu, 23 Dec 2010 15:17:38 +0000 (UTC)
Received: from repoman.freebsd.org (localhost [127.0.0.1])
	by repoman.freebsd.org (8.14.4/8.14.4) with ESMTP id oBNFHcV6036942
	for <cvs-src-old@freebsd.org>; Thu, 23 Dec 2010 15:17:38 GMT
	(envelope-from jhb@repoman.freebsd.org)
Received: (from svn2cvs@localhost)
	by repoman.freebsd.org (8.14.4/8.14.4/Submit) id oBNFHcQe036941
	for cvs-src-old@freebsd.org; Thu, 23 Dec 2010 15:17:38 GMT
	(envelope-from jhb@repoman.freebsd.org)
Message-Id: <201012231517.oBNFHcQe036941@repoman.freebsd.org>
X-Authentication-Warning: repoman.freebsd.org: svn2cvs set sender to
	jhb@repoman.freebsd.org using -f
From: John Baldwin <jhb@FreeBSD.org>
Date: Thu, 23 Dec 2010 15:17:28 +0000 (UTC)
To: cvs-src-old@freebsd.org
X-FreeBSD-CVS-Branch: HEAD
Subject: cvs commit: src/sys/x86/x86 io_apic.c
X-BeenThere: cvs-src-old@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: **OBSOLETE** CVS commit messages for the src tree
	<cvs-src-old.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src-old>,
	<mailto:cvs-src-old-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/cvs-src-old>
List-Post: <mailto:cvs-src-old@freebsd.org>
List-Help: <mailto:cvs-src-old-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src-old>,
	<mailto:cvs-src-old-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 23 Dec 2010 15:17:38 -0000

jhb         2010-12-23 15:17:28 UTC

  FreeBSD src repository

  Modified files:
    sys/x86/x86          io_apic.c 
  Log:
  SVN rev 216679 on 2010-12-23 15:17:28Z by jhb
  
  Drop the icu_lock spinlock while pausing briefly after masking the
  interrupt in the I/O APIC before moving it to a different CPU.  If the
  interrupt had been triggered by the I/O APIC after locking icu_lock but
  before we masked the pin in the I/O APIC, then this could cause the
  interrupt to be pending on the "old" CPU and it would finally trigger
  after we had moved the interrupt to the new CPU.  This could cause us to
  panic as there was no interrupt source associated with the old IDT vector
  on the old CPU.  Dropping the lock after the interrupt is masked but
  before it is moved allows the interrupt to fire and be handled in this
  case before it is moved.
  
  Tested by:      Daniel Braniss  danny of cs huji ac il
  MFC after:      1 week
  
  Revision  Changes    Path
  1.4       +2 -0      src/sys/x86/x86/io_apic.c