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=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 DF3B7C43381 for ; Tue, 26 Feb 2019 13:52:30 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 AB84B217F9 for ; Tue, 26 Feb 2019 13:52:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="jRaiLxJL" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AB84B217F9 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=st.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Cc:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=yDRHDabLxEqYBvnG9PyGJfDfv+zqNIopvtT5GNw+6e0=; b=jRaiLxJLX9m5YA LFzhfstsI/csE2p6snEPW/xD8NaR7qQ0UrHJiD/7vE1Amhfgsjmf6Y2MP0CCYV/gu5YPuRki4rssr 7EbqP9oCDY0qJtO9rILIQW2gtAr85y9iHYSsNXvvyIUQiY1Y4E5x9wH+BvS4i6+D8J7gxS1UPrNk2 jTaO3hTSuIUWm48VC6lhsUGC82JsSWySLg3QRlcH9arD6uL9N/LHLTrMahQs/y/nTqE3QBo+2LwFT RSorvDlxuP3X9Rom0IeDGW8fKRv7DG8/F1zwUTLFSfQjP8TL96Vmyg5T9XUgUmY25gW+sm0fjQnqh rny80cFmD8MNi0VC6HRw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gyd9m-0006VH-03; Tue, 26 Feb 2019 13:52:26 +0000 Received: from mx07-00178001.pphosted.com ([62.209.51.94]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gyd8q-0005MF-Qz for linux-arm-kernel@lists.infradead.org; Tue, 26 Feb 2019 13:51:32 +0000 Received: from pps.filterd (m0046037.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x1QDnKKT007733; Tue, 26 Feb 2019 14:51:23 +0100 Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 2qtvtx04bu-1 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT); Tue, 26 Feb 2019 14:51:23 +0100 Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 058B33A; Tue, 26 Feb 2019 13:51:23 +0000 (GMT) Received: from Webmail-eu.st.com (Safex1hubcas22.st.com [10.75.90.92]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id DB8A95478; Tue, 26 Feb 2019 13:51:22 +0000 (GMT) Received: from SAFEX1HUBCAS24.st.com (10.75.90.95) by Safex1hubcas22.st.com (10.75.90.92) with Microsoft SMTP Server (TLS) id 14.3.361.1; Tue, 26 Feb 2019 14:51:22 +0100 Received: from localhost (10.201.23.16) by webmail-ga.st.com (10.75.90.48) with Microsoft SMTP Server (TLS) id 14.3.361.1; Tue, 26 Feb 2019 14:51:22 +0100 From: Olivier Moysan To: , , , , , , , , , , , , Subject: [PATCH 6/7] ASoC: stm32: i2s: fix race condition in irq handler Date: Tue, 26 Feb 2019 14:51:09 +0100 Message-ID: <1551189070-15469-7-git-send-email-olivier.moysan@st.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1551189070-15469-1-git-send-email-olivier.moysan@st.com> References: <1551189070-15469-1-git-send-email-olivier.moysan@st.com> MIME-Version: 1.0 X-Originating-IP: [10.201.23.16] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-02-26_09:, , signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190226_055129_353537_E3514283 X-CRM114-Status: GOOD ( 11.88 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org When snd_pcm_stop_xrun() is called in interrupt routine, substream context may have already been released. Add protection on substream context. Signed-off-by: Olivier Moysan --- sound/soc/stm/stm32_i2s.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/sound/soc/stm/stm32_i2s.c b/sound/soc/stm/stm32_i2s.c index 9edb753ffa1b..42ce87a35104 100644 --- a/sound/soc/stm/stm32_i2s.c +++ b/sound/soc/stm/stm32_i2s.c @@ -201,6 +201,7 @@ enum i2s_datlen { * @base: mmio register base virtual address * @phys_addr: I2S registers physical base address * @lock_fd: lock to manage race conditions in full duplex mode + * @irq_lock: prevent race condition with IRQ * @dais_name: DAI name * @mclk_rate: master clock frequency (Hz) * @fmt: DAI protocol @@ -222,6 +223,7 @@ struct stm32_i2s_data { void __iomem *base; dma_addr_t phys_addr; spinlock_t lock_fd; /* Manage race conditions for full duplex */ + spinlock_t irq_lock; /* used to prevent race condition with IRQ */ char dais_name[STM32_I2S_DAI_NAME_SIZE]; unsigned int mclk_rate; unsigned int fmt; @@ -263,8 +265,10 @@ static irqreturn_t stm32_i2s_isr(int irq, void *devid) if (flags & I2S_SR_TIFRE) dev_dbg(&pdev->dev, "Frame error\n"); - if (err) + spin_lock(&i2s->irq_lock); + if (err && i2s->substream) snd_pcm_stop_xrun(i2s->substream); + spin_unlock(&i2s->irq_lock); return IRQ_HANDLED; } @@ -540,9 +544,12 @@ static int stm32_i2s_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *cpu_dai) { struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai); + unsigned long flags; int ret; + spin_lock_irqsave(&i2s->irq_lock, flags); i2s->substream = substream; + spin_unlock_irqrestore(&i2s->irq_lock, flags); ret = clk_prepare_enable(i2s->i2sclk); if (ret < 0) { @@ -673,13 +680,16 @@ static void stm32_i2s_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *cpu_dai) { struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai); - - i2s->substream = NULL; + unsigned long flags; regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG, I2S_CGFR_MCKOE, (unsigned int)~I2S_CGFR_MCKOE); clk_disable_unprepare(i2s->i2sclk); + + spin_lock_irqsave(&i2s->irq_lock, flags); + i2s->substream = NULL; + spin_unlock_irqrestore(&i2s->irq_lock, flags); } static int stm32_i2s_dai_probe(struct snd_soc_dai *cpu_dai) @@ -874,6 +884,7 @@ static int stm32_i2s_probe(struct platform_device *pdev) i2s->pdev = pdev; i2s->ms_flg = I2S_MS_NOT_SET; spin_lock_init(&i2s->lock_fd); + spin_lock_init(&i2s->irq_lock); platform_set_drvdata(pdev, i2s); ret = stm32_i2s_dais_init(pdev, i2s); -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel