From patchwork Fri Jul 11 15:56:21 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 4535991 X-Patchwork-Delegate: vinod.koul@intel.com Return-Path: X-Original-To: patchwork-dmaengine@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id AAB49BEEAA for ; Fri, 11 Jul 2014 15:56:58 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C315420160 for ; Fri, 11 Jul 2014 15:56:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C8FCA20176 for ; Fri, 11 Jul 2014 15:56:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754169AbaGKP4a (ORCPT ); Fri, 11 Jul 2014 11:56:30 -0400 Received: from andre.telenet-ops.be ([195.130.132.53]:35137 "EHLO andre.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753503AbaGKP41 (ORCPT ); Fri, 11 Jul 2014 11:56:27 -0400 Received: from ayla.of.borg ([84.193.72.141]) by andre.telenet-ops.be with bizsmtp id R3wQ1o00c32ts5g013wQcb; Fri, 11 Jul 2014 17:56:25 +0200 Received: from geert by ayla.of.borg with local (Exim 4.76) (envelope-from ) id 1X5dBQ-0003dj-EC; Fri, 11 Jul 2014 17:56:24 +0200 From: Geert Uytterhoeven To: Mark Brown , Vinod Koul , Dan Williams Cc: dmaengine@vger.kernel.org, linux-spi@vger.kernel.org, linux-sh@vger.kernel.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH v2 1/2] dmaengine: Clarify device parameter for dma_sync_*_for_*() Date: Fri, 11 Jul 2014 17:56:21 +0200 Message-Id: <1405094182-13962-1-git-send-email-geert+renesas@glider.be> X-Mailer: git-send-email 1.7.9.5 Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Signed-off-by: Geert Uytterhoeven --- v2: - New --- Documentation/dmaengine.txt | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/Documentation/dmaengine.txt b/Documentation/dmaengine.txt index 879b6e31e2da..87d3f192e160 100644 --- a/Documentation/dmaengine.txt +++ b/Documentation/dmaengine.txt @@ -100,8 +100,10 @@ The slave DMA usage consists of following steps: The peripheral driver is expected to have mapped the scatterlist for the DMA operation prior to calling device_prep_slave_sg, and must keep the scatterlist mapped until the DMA operation has completed. - The scatterlist must be mapped using the DMA struct device. So, - normal setup should look like this: + The scatterlist must be mapped using the DMA struct device. + If a mapping needs to be synchronized later, dma_sync_*_for_*() must be + called using the DMA struct device, too. + So, normal setup should look like this: nr_sg = dma_map_sg(chan->device->dev, sgl, sg_len); if (nr_sg == 0)