From owner-svn-src-stable-9@FreeBSD.ORG Sun Oct 7 18:25:34 2012 Return-Path: Delivered-To: svn-src-stable-9@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 96606106566C; Sun, 7 Oct 2012 18:25:34 +0000 (UTC) (envelope-from jhb@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c]) by mx1.freebsd.org (Postfix) with ESMTP id 815D88FC08; Sun, 7 Oct 2012 18:25:34 +0000 (UTC) Received: from svn.freebsd.org (localhost [127.0.0.1]) by svn.freebsd.org (8.14.4/8.14.4) with ESMTP id q97IPY34047461; Sun, 7 Oct 2012 18:25:34 GMT (envelope-from jhb@svn.freebsd.org) Received: (from jhb@localhost) by svn.freebsd.org (8.14.4/8.14.4/Submit) id q97IPYXn047458; Sun, 7 Oct 2012 18:25:34 GMT (envelope-from jhb@svn.freebsd.org) Message-Id: <201210071825.q97IPYXn047458@svn.freebsd.org> From: John Baldwin Date: Sun, 7 Oct 2012 18:25:34 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org X-SVN-Group: stable-9 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cc: Subject: svn commit: r241318 - stable/9/share/man/man9 X-BeenThere: svn-src-stable-9@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: SVN commit messages for only the 9-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 07 Oct 2012 18:25:34 -0000 Author: jhb Date: Sun Oct 7 18:25:33 2012 New Revision: 241318 URL: http://svn.freebsd.org/changeset/base/241318 Log: MFC 239906: Clarify that bus_dma does not stall future load requests once a load is deferred. The caller is required to enforce that if that is desired. Modified: stable/9/share/man/man9/bus_dma.9 Directory Properties: stable/9/share/man/man9/ (props changed) Modified: stable/9/share/man/man9/bus_dma.9 ============================================================================== --- stable/9/share/man/man9/bus_dma.9 Sun Oct 7 18:23:15 2012 (r241317) +++ stable/9/share/man/man9/bus_dma.9 Sun Oct 7 18:25:33 2012 (r241318) @@ -580,8 +580,13 @@ The status of the mapping has been deliv The mapping has been deferred for lack of resources. The callback will be called as soon as resources are available. Callbacks are serviced in FIFO order. -To ensure that ordering is guaranteed, all subsequent load requests will also -be deferred until all callbacks have been processed. +.Pp +Note that subsequent load operations for the same tag that do not require +extra resources will still succeed. +This may result in out-of-order processing of requests. +If the caller requires the order of requests to be preserved, +then the caller is required to stall subsequent requests until a pending +request's callback is invoked. .It Er ENOMEM The load request has failed due to insufficient resources, and the caller specifically used the