From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 55C3CC4361A for ; Tue, 2 Mar 2021 06:40:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 09C9160201 for ; Tue, 2 Mar 2021 06:40:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1573490AbhCBDXC (ORCPT ); Mon, 1 Mar 2021 22:23:02 -0500 Received: from mail.kernel.org ([198.145.29.99]:48270 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242009AbhCAU12 (ORCPT ); Mon, 1 Mar 2021 15:27:28 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id C97596541A; Mon, 1 Mar 2021 18:07:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614622030; bh=Pv9NNrYFiFCPxUMNwvBOzdGcfEdBNLjqcJM0rtlmYlc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gT94LGea2fPz5GnXCGn0InOLo/W/TFDZ8t/I0LZs2H0AydXnX7RJbmYHstQgmASze HI74mCJE+3NXNoJqSgk+SEjlfQkaDGYw15Qu4Gqw3M8uNant4qVvHdJn2FM0HeD6nM Y4wYNWBXai0R4GImD6nC26AhbdEisamC/fUNsBCc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alexander Usyskin , Tomas Winkler , Guenter Roeck , Wim Van Sebroeck Subject: [PATCH 5.11 691/775] watchdog: mei_wdt: request stop on unregister Date: Mon, 1 Mar 2021 17:14:19 +0100 Message-Id: <20210301161235.533111114@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210301161201.679371205@linuxfoundation.org> References: <20210301161201.679371205@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alexander Usyskin commit 740c0a57b8f1e36301218bf549f3c9cc833a60be upstream. The MEI bus has a special behavior on suspend it destroys all the attached devices, this is due to the fact that also firmware context is not persistent across power flows. If watchdog on MEI bus is ticking before suspending the firmware times out and reports that the OS is missing watchdog tick. Send the stop command to the firmware on watchdog unregistered to eliminate the false event on suspend. This does not make the things worse from the user-space perspective as a user-space should re-open watchdog device after suspending before this patch. Cc: Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler Reviewed-by: Guenter Roeck Link: https://lore.kernel.org/r/20210124114938.373885-1-tomas.winkler@intel.com Signed-off-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck Signed-off-by: Greg Kroah-Hartman --- drivers/watchdog/mei_wdt.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/watchdog/mei_wdt.c +++ b/drivers/watchdog/mei_wdt.c @@ -382,6 +382,7 @@ static int mei_wdt_register(struct mei_w watchdog_set_drvdata(&wdt->wdd, wdt); watchdog_stop_on_reboot(&wdt->wdd); + watchdog_stop_on_unregister(&wdt->wdd); ret = watchdog_register_device(&wdt->wdd); if (ret)