From patchwork Thu Nov 11 15:48:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vladimir Zapolskiy X-Patchwork-Id: 12615229 X-Patchwork-Delegate: viresh.linux@gmail.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7FDFDC43219 for ; Thu, 11 Nov 2021 15:48:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6B92F61989 for ; Thu, 11 Nov 2021 15:48:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233902AbhKKPvO (ORCPT ); Thu, 11 Nov 2021 10:51:14 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46438 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233928AbhKKPvN (ORCPT ); Thu, 11 Nov 2021 10:51:13 -0500 Received: from mail-lj1-x22a.google.com (mail-lj1-x22a.google.com [IPv6:2a00:1450:4864:20::22a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6457DC061203 for ; Thu, 11 Nov 2021 07:48:22 -0800 (PST) Received: by mail-lj1-x22a.google.com with SMTP id e11so12699411ljo.13 for ; Thu, 11 Nov 2021 07:48:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=vm/CQHumQ1uukLhv2xWgernc5RdPc12W87OkHQ+477Y=; b=XxYpt9ltP6c2AopfLgF2vjY1/uR0wJbA6FIaTCU0bHqBNAUESxTcjoMHGcQE44/F49 g2/Eqp44C67yN0k1oYUAK0ezbq551E5kWKCklGqv/4Pr5akDOhsXFLcefNkUj1onGca6 FFU6u5YoOgl6A9b8ZEuvakwMyXpvUIjzsA0LSJp9JqzP6HIrh8Nlnl3zySVIsTSuIoge y7bPGKFpsGgazAvZzhx4vt8Yym6jNbd8P1tnNGCpCjbCU5GpzrlER9PSeDG0K3TqMjpB cQBCatYgMqx6xvxvZSLmJAIBBF/qri4+U6FAKWejbwGDFOceBM5oW4wqnLlHIawVK3L+ emsQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=vm/CQHumQ1uukLhv2xWgernc5RdPc12W87OkHQ+477Y=; b=B/3uekh+CiWefK00MWBgmCB+t9cyhIQDAI/d/Z0ypLkckfU+kM/3jAOPS03iWPoT+J IlLwWXL801lMo0T8UqgHD8PyYByJaLygrzISFpWyvz0leJFXIgzveaYkZ+ixtfd6dGv7 H0zpdnsyEt9dFWJzLlRQZM75LANmHKc8ru2jzsnGZOFSzh+jQvhTAFlILF/B8vkZaZmU syJiUwubF8a8Vyqvv1WcTRVwHEWoNBFrRX+EGLM8i8lNN0BMn/hgHAa3d9kV49xXhcgQ dIfgBrVxnPqBzDiGBvJmgNhsKJiDOPY3TN3c777alSzSzzwtTSYrq76fYPVjsqRIi+Dr HO1w== X-Gm-Message-State: AOAM531af63jRt3EbM3Q6zeVi8YaT/2Tun69+g3P5qhJsoDzm8Q4f3Vy xTqvQ3Ud70tVQMW92B+3S8ouxw== X-Google-Smtp-Source: ABdhPJwsvEUTrt78lmjoUsS8uiF0aU5osIvGnEd7eZ3BWeyJKnI1IJJEq2bqsGLYoTTheTHAjmVI5w== X-Received: by 2002:a2e:869a:: with SMTP id l26mr8408179lji.453.1636645700806; Thu, 11 Nov 2021 07:48:20 -0800 (PST) Received: from localhost.localdomain (62-248-207-242.elisa-laajakaista.fi. [62.248.207.242]) by smtp.gmail.com with ESMTPSA id t9sm317072lfe.88.2021.11.11.07.48.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 Nov 2021 07:48:20 -0800 (PST) From: Vladimir Zapolskiy To: Viresh Kumar , "Rafael J. Wysocki" , Thara Gopinath Cc: Bjorn Andersson , linux-arm-msm@vger.kernel.org, linux-pm@vger.kernel.org Subject: [PATCH 2/3] cpufreq: qcom-hw: Fix probable nested interrupt handling Date: Thu, 11 Nov 2021 17:48:07 +0200 Message-Id: <20211111154808.2024808-3-vladimir.zapolskiy@linaro.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20211111154808.2024808-1-vladimir.zapolskiy@linaro.org> References: <20211111154808.2024808-1-vladimir.zapolskiy@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Re-enabling an interrupt from its own interrupt handler may cause an interrupt storm, if there is a pending interrupt and because its handling is disabled due to already done entrance into the handler above in the stack. Also, apparently it is improper to lock a mutex in an interrupt contex. Fixes: 275157b367f4 ("cpufreq: qcom-cpufreq-hw: Add dcvs interrupt support") Signed-off-by: Vladimir Zapolskiy Reviewed-by: Matthias Kaehlcke Reviewed-by: Bjorn Andersson --- drivers/cpufreq/qcom-cpufreq-hw.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c index 3b5835336658..5d55217caa8b 100644 --- a/drivers/cpufreq/qcom-cpufreq-hw.c +++ b/drivers/cpufreq/qcom-cpufreq-hw.c @@ -343,9 +343,9 @@ static irqreturn_t qcom_lmh_dcvs_handle_irq(int irq, void *data) /* Disable interrupt and enable polling */ disable_irq_nosync(c_data->throttle_irq); - qcom_lmh_dcvs_notify(c_data); + schedule_delayed_work(&c_data->throttle_work, 0); - return 0; + return IRQ_HANDLED; } static const struct qcom_cpufreq_soc_data qcom_soc_data = {