From owner-cvs-src@FreeBSD.ORG  Wed Feb  9 11:44:15 2005
Return-Path: <owner-cvs-src@FreeBSD.ORG>
Delivered-To: cvs-src@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id 8085016A4CE; Wed,  9 Feb 2005 11:44:15 +0000 (GMT)
Received: from repoman.freebsd.org (repoman.freebsd.org [216.136.204.115])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 56AC243D1D; Wed,  9 Feb 2005 11:44:15 +0000 (GMT)
	(envelope-from scottl@FreeBSD.org)
Received: from repoman.freebsd.org (localhost [127.0.0.1])
	by repoman.freebsd.org (8.13.1/8.13.1) with ESMTP id j19BiFFe073111;
	Wed, 9 Feb 2005 11:44:15 GMT
	(envelope-from scottl@repoman.freebsd.org)
Received: (from scottl@localhost)
	by repoman.freebsd.org (8.13.1/8.13.1/Submit) id j19BiF4l073110;
	Wed, 9 Feb 2005 11:44:15 GMT
	(envelope-from scottl)
Message-Id: <200502091144.j19BiF4l073110@repoman.freebsd.org>
From: Scott Long <scottl@FreeBSD.org>
Date: Wed, 9 Feb 2005 11:44:15 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
	cvs-all@FreeBSD.org
X-FreeBSD-CVS-Branch: HEAD
Subject: cvs commit: src/sys/cam cam_xpt.c
X-BeenThere: cvs-src@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: CVS commit messages for the src tree <cvs-src.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src>,
	<mailto:cvs-src-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/cvs-src>
List-Post: <mailto:cvs-src@freebsd.org>
List-Help: <mailto:cvs-src-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src>,
	<mailto:cvs-src-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 09 Feb 2005 11:44:15 -0000

scottl      2005-02-09 11:44:15 UTC

  FreeBSD src repository

  Modified files:
    sys/cam              cam_xpt.c 
  Log:
  Provide locking for the ccb_bioq.  This allows xpt_done() to be called without
  Giant held.  In camisr(), move the ccb_bioq elements to a temporary local list
  and then process the elements off of that list.  This enables the list to be
  processed by only taking the ccb_bioq_lock once and only for a very short
  time.
  
  ccb_bioq_lock is a leaf mutex, so it's fine to call xpt_done() with other
  locks held.  This is just a very minor step in the work to lock CAM, but
  it allows us to avoid some messy locking/unlock dances in certain drivers.
  
  Revision  Changes    Path
  1.149     +22 -5     src/sys/cam/cam_xpt.c