From patchwork Wed Feb 12 11:05:40 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mika Westerberg X-Patchwork-Id: 11378331 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4FC61186E for ; Wed, 12 Feb 2020 11:05:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3A2042173E for ; Wed, 12 Feb 2020 11:05:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727347AbgBLLFp (ORCPT ); Wed, 12 Feb 2020 06:05:45 -0500 Received: from mga11.intel.com ([192.55.52.93]:58048 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725887AbgBLLFp (ORCPT ); Wed, 12 Feb 2020 06:05:45 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 12 Feb 2020 03:05:44 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,428,1574150400"; d="scan'208";a="237680103" Received: from black.fi.intel.com ([10.237.72.28]) by orsmga006.jf.intel.com with ESMTP; 12 Feb 2020 03:05:42 -0800 Received: by black.fi.intel.com (Postfix, from userid 1001) id 350BD1F6; Wed, 12 Feb 2020 13:05:41 +0200 (EET) From: Mika Westerberg To: Jean Delvare , "Rafael J. Wysocki" Cc: Len Brown , linux-acpi@vger.kernel.org, Wim Van Sebroeck , Guenter Roeck , linux-watchdog@vger.kernel.org, Tom Abraham , Mika Westerberg Subject: [PATCH 3/3] ACPI / watchdog: Set default timeout in probe Date: Wed, 12 Feb 2020 14:05:40 +0300 Message-Id: <20200212110540.83559-3-mika.westerberg@linux.intel.com> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200212110540.83559-1-mika.westerberg@linux.intel.com> References: <20200211180331.11dbe525@endymion> <20200212110540.83559-1-mika.westerberg@linux.intel.com> MIME-Version: 1.0 Sender: linux-watchdog-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org If the BIOS default timeout for the watchdog is too small userspace may not have enough time to configure new timeout after opening the device before the system is already reset. For this reason program default timeout of 30 seconds in the driver probe and allow userspace to change this from command line or through module parameter (wdat_wdt.timeout). Reported-by: Jean Delvare Signed-off-by: Mika Westerberg --- drivers/watchdog/wdat_wdt.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/watchdog/wdat_wdt.c b/drivers/watchdog/wdat_wdt.c index 2132018f031d..7b0257163522 100644 --- a/drivers/watchdog/wdat_wdt.c +++ b/drivers/watchdog/wdat_wdt.c @@ -54,6 +54,13 @@ module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); +#define WDAT_DEFAULT_TIMEOUT 30 + +static int timeout = WDAT_DEFAULT_TIMEOUT; +module_param(timeout, int, 0); +MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (default=" + __MODULE_STRING(WDAT_DEFAULT_TIMEOUT) ")"); + static int wdat_wdt_read(struct wdat_wdt *wdat, const struct wdat_instruction *instr, u32 *value) { @@ -308,6 +315,7 @@ static int wdat_wdt_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; const struct acpi_wdat_entry *entries; const struct acpi_table_wdat *tbl; + int default_timeout = timeout; struct wdat_wdt *wdat; struct resource *res; void __iomem **regs; @@ -438,6 +446,22 @@ static int wdat_wdt_probe(struct platform_device *pdev) platform_set_drvdata(pdev, wdat); + /* + * Set initial timeout so that userspace has time to configure + * the watchdog properly after it has opened the device. In some + * cases the BIOS default is too short and causes immediate reboot. + */ + default_timeout = timeout; + if (timeout < wdat->wdd.min_hw_heartbeat_ms || + timeout > wdat->wdd.max_hw_heartbeat_ms) + default_timeout = WDAT_DEFAULT_TIMEOUT; + else + default_timeout = timeout; + + ret = wdat_wdt_set_timeout(&wdat->wdd, timeout); + if (ret) + return ret; + watchdog_set_nowayout(&wdat->wdd, nowayout); return devm_watchdog_register_device(dev, &wdat->wdd); }