From patchwork Fri May 15 04:09:39 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brent Lu X-Patchwork-Id: 192700 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=-9.7 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, 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 13C1DC433E1 for ; Fri, 15 May 2020 04:16:59 +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 90077206F1 for ; Fri, 15 May 2020 04:16:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alsa-project.org header.i=@alsa-project.org header.b="a7nxXHSU" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 90077206F1 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com 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 CAEB81607; Fri, 15 May 2020 06:16:04 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz CAEB81607 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1589516214; bh=i71ITxgRhAvhS2eQyHPYe5WKcQwlnFq9YtULV96ViDs=; h=From:To:Subject:Date:Cc:List-Id:List-Unsubscribe:List-Archive: List-Post:List-Help:List-Subscribe:From; b=a7nxXHSUYEr/tEHTa7geGhHkS0RPcbb0ieGMczjzX+PU1idwvCBlRc5sA2wAKTxG1 VYRzMYOEPzR/TGUUqvxgcMJf9gmCVqNNFffh//m71xKMiWXGj9PScdpLDtGTfuqobT pBwbAjF6Lb3ttJUoPpC0zx4Fl9eMlj3jhvNsKyq4= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 3E167F8022D; Fri, 15 May 2020 06:16:04 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id B664EF80247; Fri, 15 May 2020 06:16:00 +0200 (CEST) Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 922EBF800E3 for ; Fri, 15 May 2020 06:15:51 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 922EBF800E3 IronPort-SDR: LdUSV3SrlPGW7jYtPRx8iyraExoVUNR0pwKT2QxmJekPCY0Fiw5f926nsMGGkr0aazV7YM25AF aCDi9H6jbPBg== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 May 2020 21:15:47 -0700 IronPort-SDR: h21gBEuc1WSXsq8NSuif0vOqjl206dBqGYH1UlpT5XC4yIptNdSmDunNfMV8M5pQJWRmKg1I1p 4q4+5QVdf89A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,393,1583222400"; d="scan'208";a="253683839" Received: from brentlu-desk0.itwn.intel.com ([10.5.253.11]) by fmsmga008.fm.intel.com with ESMTP; 14 May 2020 21:15:42 -0700 From: Brent Lu To: alsa-devel@alsa-project.org Subject: [PATCH] ALSA: pcm: fix incorrect hw_base increase Date: Fri, 15 May 2020 12:09:39 +0800 Message-Id: <1589515779-20987-1-git-send-email-brent.lu@intel.com> X-Mailer: git-send-email 2.7.4 Cc: Arnd Bergmann , Baolin Wang , Greg Kroah-Hartman , Takashi Iwai , Richard Fontana , Thomas Gleixner , paulhsia , Brent Lu , linux-kernel@vger.kernel.org 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" The hw_base will be increased by runtime->buffer_size frames unconditionally if the runtime->status->hw_ptr is not updated for over half of buffer time. As the hw_base increases, so does the runtime->status->hw_ptr which could lead to invalid return value when user space program calls snd_pcm_avail() function. By updating runtime->hw_ptr_jiffies each time the HWSYNC is called, the hw_base will keep the same when buffer stall happens, so does the hw_ptr. Signed-off-by: Brent Lu --- sound/core/pcm_lib.c | 1 + 1 file changed, 1 insertion(+) diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c index 872a852..d531e1b 100644 --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -433,6 +433,7 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream, no_delta_check: if (runtime->status->hw_ptr == new_hw_ptr) { + runtime->hw_ptr_jiffies = curr_jiffies; update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp); return 0; }