Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933110AbbGVDsw (ORCPT ); Tue, 21 Jul 2015 23:48:52 -0400 Received: from bh-25.webhostbox.net ([208.91.199.152]:49207 "EHLO bh-25.webhostbox.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932093AbbGVDsu (ORCPT ); Tue, 21 Jul 2015 23:48:50 -0400 Message-ID: <55AF1285.9000404@roeck-us.net> Date: Tue, 21 Jul 2015 20:48:21 -0700 From: Guenter Roeck User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 MIME-Version: 1.0 To: Eddie Huang , Wim Van Sebroeck CC: Matthias Brugger , linux-watchdog@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, Sascha Hauer , Greta Zhang Subject: Re: [PATCH 2/2] watchdog: add wdt shutdown callback to disable wdt if enabled References: <1437535610-51314-1-git-send-email-eddie.huang@mediatek.com> <1437535610-51314-3-git-send-email-eddie.huang@mediatek.com> In-Reply-To: <1437535610-51314-3-git-send-email-eddie.huang@mediatek.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-Authenticated_sender: linux@roeck-us.net X-OutGoing-Spam-Status: No, score=-1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - bh-25.webhostbox.net X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - roeck-us.net X-Get-Message-Sender-Via: bh-25.webhostbox.net: authenticated_id: linux@roeck-us.net X-Source: X-Source-Args: X-Source-Dir: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1740 Lines: 51 On 07/21/2015 08:26 PM, Eddie Huang wrote: > From: Greta Zhang > > Without .shutdown(), watchdog might reset the system during power off. > For example, if watchdog's timeout is set to 30s, then it is reset to > zero by mtk_wdt_ping(). During power off, no app will ping watchdog, > but watchdog is still running and may trigger reset. > > Signed-off-by: Greta Zhang > Signed-off-by: Eddie Huang > --- > drivers/watchdog/mtk_wdt.c | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c > index 5ef3910..c6741a5 100644 > --- a/drivers/watchdog/mtk_wdt.c > +++ b/drivers/watchdog/mtk_wdt.c > @@ -217,6 +217,14 @@ static int mtk_wdt_probe(struct platform_device *pdev) > return 0; > } > > +static void mtk_wdt_shutdown(struct platform_device *pdev) > +{ > + struct mtk_wdt_dev *mtk_wdt = platform_get_drvdata(pdev); > + > + if (mtk_wdt->started) watchdog_active() ? > + mtk_wdt_stop(&mtk_wdt->wdt_dev); > +} > + > static int mtk_wdt_remove(struct platform_device *pdev) > { > struct mtk_wdt_dev *mtk_wdt = platform_get_drvdata(pdev); > @@ -266,6 +274,7 @@ MODULE_DEVICE_TABLE(of, mtk_wdt_dt_ids); > static struct platform_driver mtk_wdt_driver = { > .probe = mtk_wdt_probe, > .remove = mtk_wdt_remove, > + .shutdown = mtk_wdt_shutdown, > .suspend = mtk_wdt_suspend, > .resume = mtk_wdt_resume, > .driver = { > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/