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=-11.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 2ECE1C07E96 for ; Thu, 8 Jul 2021 07:13:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0E11F61CDF for ; Thu, 8 Jul 2021 07:13:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229868AbhGHHQW (ORCPT ); Thu, 8 Jul 2021 03:16:22 -0400 Received: from smtp-out2.suse.de ([195.135.220.29]:32822 "EHLO smtp-out2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229669AbhGHHQV (ORCPT ); Thu, 8 Jul 2021 03:16:21 -0400 Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out2.suse.de (Postfix) with ESMTP id 2339720161; Thu, 8 Jul 2021 07:13:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1625728419; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Xm801qlOgDTdwA0+ZHys/QkRvVO84weEPSbBZ/1uzdA=; b=pK31RxHSDcs3PbALgjEKQf7BNoj5+FWXoLDwxFUb819lkqSV3wuZfkbzkOcqyGEnrTD1aT xmIwiqnNNnWIIlZVgas39789yj6gB/Ww6Z07JO0qLbXIbEgGcUyQ6lByZnS7sqxETb7j17 6gCvLvmfATVv5n1vqODYl+XALhvmHHk= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1625728419; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Xm801qlOgDTdwA0+ZHys/QkRvVO84weEPSbBZ/1uzdA=; b=5qrZeLrPoDl0JQBsDPlez05Z/f9bL6nqljng5m3xqbFyZkx4TZ2Rf279T1Af7Y1ij3MKhA ZNOD48vx9w8N8iDA== Received: from alsa1.suse.de (alsa1.suse.de [10.160.4.42]) by relay2.suse.de (Postfix) with ESMTP id 166ECA3B88; Thu, 8 Jul 2021 07:13:39 +0000 (UTC) Date: Thu, 08 Jul 2021 09:13:39 +0200 Message-ID: From: Takashi Iwai To: Max Filippov Cc: Sergey Senozhatsky , alsa-devel@alsa-project.org, Leon Romanovsky , Takashi Iwai , LKML , "Gustavo A. R. Silva" Subject: Re: ALSA: intel8x0: div by zero in snd_intel8x0_update() In-Reply-To: References: User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.8 Emacs/25.3 (x86_64-suse-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 07 Jul 2021 22:33:22 +0200, Max Filippov wrote: > > On Wed, Jul 7, 2021 at 11:14 AM Takashi Iwai wrote: > > On Wed, 07 Jul 2021 19:50:07 +0200, Max Filippov wrote: > > > It didn't change anything in my case. My further observation is that > > > the snd_intel8x0_update is called before the ichdev->prepared > > > is set to one and as a result IRQ is apparently never cleared. > > > > So it's broken in anyway no matter whether > > intel8x0_measure_ac97_clock() is called or not, right? > > The change that you suggested didn't eliminate the call to > intel8x0_measure_ac97_clock, it's still called and an interrupt > flood happens at the same place. Ah I see the point. Then the fix would be a oneliner like below. Takashi --- a/sound/pci/intel8x0.c +++ b/sound/pci/intel8x0.c @@ -694,7 +694,7 @@ static inline void snd_intel8x0_update(struct intel8x0 *chip, struct ichdev *ich int status, civ, i, step; int ack = 0; - if (!ichdev->prepared || ichdev->suspended) + if (!(ichdev->prepared || ichdev->in_measurement) || ichdev->suspended) return; spin_lock_irqsave(&chip->reg_lock, flags); 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=-9.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 38EB3C07E96 for ; Thu, 8 Jul 2021 07:14:49 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A2678619B4 for ; Thu, 8 Jul 2021 07:14:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A2678619B4 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=alsa-devel-bounces@alsa-project.org Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 1522A828; Thu, 8 Jul 2021 09:13:55 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 1522A828 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1625728485; bh=gilWgGy/wi4vfUDE3rKczk0I+u8eWLcpWkoa7/DnUbA=; h=Date:From:To:Subject:In-Reply-To:References:Cc:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=WcaZrlO5gDmh0/vAimQbj2+Zl13AG3rYpK226Nh+Wy/EkeHqxyWl8LZY/EO3LuYJz hemukxNpEU/r3O9/LVyzmTEmFdap3nyg0IA8KCsVZ5gwMlokGwEuNp3uDZQux8sjUt g7F8ROM6dmucgWF+ciLW8bcas5a6BhnMR/JsqMCs= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 65AC8F80246; Thu, 8 Jul 2021 09:13:54 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 4C8A3F80249; Thu, 8 Jul 2021 09:13:52 +0200 (CEST) Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id A97EBF8012A for ; Thu, 8 Jul 2021 09:13:44 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz A97EBF8012A Authentication-Results: alsa1.perex.cz; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b="pK31RxHS"; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b="5qrZeLrP" Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out2.suse.de (Postfix) with ESMTP id 2339720161; Thu, 8 Jul 2021 07:13:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1625728419; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Xm801qlOgDTdwA0+ZHys/QkRvVO84weEPSbBZ/1uzdA=; b=pK31RxHSDcs3PbALgjEKQf7BNoj5+FWXoLDwxFUb819lkqSV3wuZfkbzkOcqyGEnrTD1aT xmIwiqnNNnWIIlZVgas39789yj6gB/Ww6Z07JO0qLbXIbEgGcUyQ6lByZnS7sqxETb7j17 6gCvLvmfATVv5n1vqODYl+XALhvmHHk= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1625728419; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Xm801qlOgDTdwA0+ZHys/QkRvVO84weEPSbBZ/1uzdA=; b=5qrZeLrPoDl0JQBsDPlez05Z/f9bL6nqljng5m3xqbFyZkx4TZ2Rf279T1Af7Y1ij3MKhA ZNOD48vx9w8N8iDA== Received: from alsa1.suse.de (alsa1.suse.de [10.160.4.42]) by relay2.suse.de (Postfix) with ESMTP id 166ECA3B88; Thu, 8 Jul 2021 07:13:39 +0000 (UTC) Date: Thu, 08 Jul 2021 09:13:39 +0200 Message-ID: From: Takashi Iwai To: Max Filippov Subject: Re: ALSA: intel8x0: div by zero in snd_intel8x0_update() In-Reply-To: References: User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL/10.8 Emacs/25.3 (x86_64-suse-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII Cc: alsa-devel@alsa-project.org, Leon Romanovsky , LKML , "Gustavo A. R. Silva" , Takashi Iwai , Sergey Senozhatsky X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" On Wed, 07 Jul 2021 22:33:22 +0200, Max Filippov wrote: > > On Wed, Jul 7, 2021 at 11:14 AM Takashi Iwai wrote: > > On Wed, 07 Jul 2021 19:50:07 +0200, Max Filippov wrote: > > > It didn't change anything in my case. My further observation is that > > > the snd_intel8x0_update is called before the ichdev->prepared > > > is set to one and as a result IRQ is apparently never cleared. > > > > So it's broken in anyway no matter whether > > intel8x0_measure_ac97_clock() is called or not, right? > > The change that you suggested didn't eliminate the call to > intel8x0_measure_ac97_clock, it's still called and an interrupt > flood happens at the same place. Ah I see the point. Then the fix would be a oneliner like below. Takashi --- a/sound/pci/intel8x0.c +++ b/sound/pci/intel8x0.c @@ -694,7 +694,7 @@ static inline void snd_intel8x0_update(struct intel8x0 *chip, struct ichdev *ich int status, civ, i, step; int ack = 0; - if (!ichdev->prepared || ichdev->suspended) + if (!(ichdev->prepared || ichdev->in_measurement) || ichdev->suspended) return; spin_lock_irqsave(&chip->reg_lock, flags);