From patchwork Mon Aug 5 16:14:57 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Fernandes X-Patchwork-Id: 2838769 Return-Path: X-Original-To: patchwork-linux-omap@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 857A79F479 for ; Mon, 5 Aug 2013 16:17:45 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 5EA2A2025B for ; Mon, 5 Aug 2013 16:17:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1822520258 for ; Mon, 5 Aug 2013 16:17:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754631Ab3HEQRV (ORCPT ); Mon, 5 Aug 2013 12:17:21 -0400 Received: from arroyo.ext.ti.com ([192.94.94.40]:39709 "EHLO arroyo.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753253Ab3HEQRT (ORCPT ); Mon, 5 Aug 2013 12:17:19 -0400 Received: from dlelxv90.itg.ti.com ([172.17.2.17]) by arroyo.ext.ti.com (8.13.7/8.13.7) with ESMTP id r75GFGNG029617; Mon, 5 Aug 2013 11:15:16 -0500 Received: from DLEE71.ent.ti.com (dlee71.ent.ti.com [157.170.170.114]) by dlelxv90.itg.ti.com (8.14.3/8.13.8) with ESMTP id r75GFFMG022437; Mon, 5 Aug 2013 11:15:15 -0500 Received: from dlelxv22.itg.ti.com (172.17.1.197) by DLEE71.ent.ti.com (157.170.170.114) with Microsoft SMTP Server id 14.2.342.3; Mon, 5 Aug 2013 11:15:15 -0500 Received: from joel-laptop.itg.ti.com (h0-56.vpn.ti.com [172.24.0.56]) by dlelxv22.itg.ti.com (8.13.8/8.13.8) with ESMTP id r75GEv1U026253; Mon, 5 Aug 2013 11:15:14 -0500 From: Joel Fernandes To: Tony Lindgren , Sekhar Nori , Santosh Shilimkar , Sricharan R , Rajendra Nayak , Lokesh Vutla , Matt Porter , Grant Likely , Rob Herring , Vinod Koul , Dan Williams , Mark Brown , Benoit Cousson , Russell King , Arnd Bergmann , Olof Johansson , Balaji TK , Gururaja Hebbar , Chris Ball , Jason Kridner CC: Linux OMAP List , Linux ARM Kernel List , Linux DaVinci Kernel List , Linux Kernel Mailing List , Linux MMC List , Joel Fernandes Subject: [PATCH v3 12/12] dma: edma: Return if nothing left todo in edma_execute Date: Mon, 5 Aug 2013 11:14:57 -0500 Message-ID: <1375719297-12871-13-git-send-email-joelf@ti.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1375719297-12871-1-git-send-email-joelf@ti.com> References: <1375719297-12871-1-git-send-email-joelf@ti.com> MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Spam-Status: No, score=-5.2 required=5.0 tests=BAYES_00,KHOP_BIG_TO_CC, 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 It is possible edma_execute is called even when all the SG elements have been submitted for transmission, we add a check for the same and avoid executing the rest of the function. Signed-off-by: Joel Fernandes --- drivers/dma/edma.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c index eca1b47..62987fc 100644 --- a/drivers/dma/edma.c +++ b/drivers/dma/edma.c @@ -168,6 +168,9 @@ static void edma_execute(struct edma_chan *echan) total_left = edesc->pset_nr - edesc->total_processed; total_link_set = total_left > MAX_NR_LS ? MAX_NR_LS : total_left; + if (!total_left) + return; + /* First time, setup 2 cyclically linked sets, each containing half the slots allocated for this channel */ if (edesc->total_processed == 0) {