From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754565AbYIYTAm (ORCPT ); Thu, 25 Sep 2008 15:00:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753013AbYIYTAd (ORCPT ); Thu, 25 Sep 2008 15:00:33 -0400 Received: from az33egw01.freescale.net ([192.88.158.102]:60495 "EHLO az33egw01.freescale.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752899AbYIYTAd (ORCPT ); Thu, 25 Sep 2008 15:00:33 -0400 Message-ID: <48DBDFC7.1060907@freescale.com> Date: Thu, 25 Sep 2008 14:00:23 -0500 From: Scott Wood User-Agent: Mozilla-Thunderbird 2.0.0.16 (X11/20080724) MIME-Version: 1.0 To: Timur Tabi CC: Li Yang , linuxppc-dev@ozlabs.org, dan.j.williams@intel.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] fsl-dma: allow Freescale Elo DMA driver to be compiled as a module References: <1222293567-17694-1-git-send-email-timur@freescale.com> <2a27d3730809242354u4cc24b96yda3973bfc3ddac92@mail.gmail.com> <48DB9816.4020603@freescale.com> <20080925184020.GA5230@ld0162-tx32.am.freescale.net> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Timur Tabi wrote: > There are no dependencies. fsldma registers with the DMA engine, > which is always built in-kernel. The DMA engine is what handles > linking DMA clients to DMA drivers. The DMA clients get a callback > whenever a DMA driver registers with the DMA engine. If the DMA > driver is already registered when the client registers, then the > client will get a callback immediately after it registers. > > I chose subsys_initcall() to increase the probability that fsldma is > already present when DMA clients are loaded/initialized and register. If there's no dependency, why does it matter whether fsldma is already present? -Scott