From patchwork Wed Mar 9 22:39:37 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Baryshkov X-Patchwork-Id: 550255 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6DA5BC43217 for ; Wed, 9 Mar 2022 22:39:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238779AbiCIWkz (ORCPT ); Wed, 9 Mar 2022 17:40:55 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44562 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238783AbiCIWky (ORCPT ); Wed, 9 Mar 2022 17:40:54 -0500 Received: from mail-lf1-x134.google.com (mail-lf1-x134.google.com [IPv6:2a00:1450:4864:20::134]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1BD32121515 for ; Wed, 9 Mar 2022 14:39:55 -0800 (PST) Received: by mail-lf1-x134.google.com with SMTP id h14so6288435lfk.11 for ; Wed, 09 Mar 2022 14:39:55 -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=pJDgp8CUHpaD9ylrQ246UHOo+e5y0DJxgmBYb+4fh+o=; b=sy548dNInrhOj5feycY52wgoXI3ozYCkS8dmdfepJS7zBpWTBgg10z/8mrOyttEF4Q Y9v89AjI9ZoDxB5Rjyv67CrfUproJjHZe8mwUml6kpQWrrmzMbEwdTTTqv+m6uM/5hws aVzj0rTRDE5RSqGkZPVB+sS2hw5qwGsuWhzqamJ06xmsKFGKIHUtZDP8Xbi4ZTEYtM9d DpJYI4ViGKcTr/bSTZL9OWIRT4LV00QvzYo1USk6SM2OWRjAJecPyfK7Zg3YhIXAzoEV E3ZfU3CYKhRUQbl341VgtHDgOL5uN4fXvWwigMu/1OdiTjpUI++2mXbghwFo0YY7u3xo wJhQ== 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=pJDgp8CUHpaD9ylrQ246UHOo+e5y0DJxgmBYb+4fh+o=; b=7zlbGJynkMe+D+ipOyAaCt/KWKrHzal+MQRYRxqJtG60s+zk93XTkXrdKnoQ+Y65aJ imZFC9e+ap868RSLWEx77KUJaA8B9LT2pJUxk7wW5c8w72RBX3ZAtMAoyWCqG3V+WMnP QXQ6nG/kSoHfKBKNf2rU1RC+UHpo3DGt68TiTY43Do+StrmZ/OolG/CjqiB5Y+FaycbD iF4nHVFWw7Xe6MOHYWWD+3Wgh0OiYSCl8Wo8q2ET6IsMjpD5uPg0ify6699wcw4EKq5E YocKc/xkZSI5Ggrtt++y9uPcTy40VLSo3PNCqmlYBfdqbzByb8CuYKAlMPD1gwcgqh9U mEaA== X-Gm-Message-State: AOAM532IN1haLToe1jXyHf9ySdsPNGLFJl4nzz6huS7OQA/4T28qcDwq rb1gROnxqfbmzER9UuOwhOzeow== X-Google-Smtp-Source: ABdhPJz1ZSV7nbVu4FjfGFbR6MkSnvkaCK8R8D1cTZ7BJbfk7H/MMzGuibgBRiKzTduLZXPMJ2XP/w== X-Received: by 2002:ac2:58cc:0:b0:443:fbed:4613 with SMTP id u12-20020ac258cc000000b00443fbed4613mr1168069lfo.317.1646865593476; Wed, 09 Mar 2022 14:39:53 -0800 (PST) Received: from eriador.lan ([37.153.55.125]) by smtp.gmail.com with ESMTPSA id b24-20020a196458000000b004483734e0afsm621036lfj.12.2022.03.09.14.39.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Mar 2022 14:39:52 -0800 (PST) From: Dmitry Baryshkov To: Andy Gross , Bjorn Andersson , "Rafael J. Wysocki" , Viresh Kumar Cc: linux-arm-msm@vger.kernel.org, linux-pm@vger.kernel.org, Thara Gopinath Subject: [PATCH v2 3/4] cpufreq: qcom-hw: fix the opp entries refcounting Date: Thu, 10 Mar 2022 01:39:37 +0300 Message-Id: <20220309223938.3819715-4-dmitry.baryshkov@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220309223938.3819715-1-dmitry.baryshkov@linaro.org> References: <20220309223938.3819715-1-dmitry.baryshkov@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org The qcom_lmh_dcvs_notify() will get the dev_pm_opp instance for throttling, but will not put it, ending up with leaking a reference count and the following backtrace when putting the CPU offline. Correctly put the reference count of the returned opp instance. [ 84.418025] ------------[ cut here ]------------ [ 84.422770] WARNING: CPU: 7 PID: 43 at drivers/opp/core.c:1396 _opp_table_kref_release+0x188/0x190 [ 84.431966] Modules linked in: [ 84.435106] CPU: 7 PID: 43 Comm: cpuhp/7 Tainted: G S 5.17.0-rc6-00388-g7cf3c0d89c44-dirty #721 [ 84.451631] pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) [ 84.458781] pc : _opp_table_kref_release+0x188/0x190 [ 84.463878] lr : _opp_table_kref_release+0x78/0x190 [ 84.468885] sp : ffff80000841bc70 [ 84.472294] x29: ffff80000841bc70 x28: ffff6664afe3d000 x27: ffff1db6729e5908 [ 84.479621] x26: 0000000000000000 x25: 0000000000000000 x24: ffff1db6729e58e0 [ 84.486946] x23: ffff8000080a5000 x22: ffff1db40aad80e0 x21: ffff1db4002fec80 [ 84.494277] x20: ffff1db40aad8000 x19: ffffb751c3186300 x18: ffffffffffffffff [ 84.501603] x17: 5300326563697665 x16: 645f676e696c6f6f x15: 00001186c1df5448 [ 84.508928] x14: 00000000000002e9 x13: 0000000000000000 x12: 0000000000000000 [ 84.516256] x11: ffffb751c3186368 x10: ffffb751c39a2a70 x9 : 0000000000000000 [ 84.523585] x8 : ffff1db4008edf00 x7 : ffffb751c328c000 x6 : 0000000000000001 [ 84.530916] x5 : 0000000000040000 x4 : 0000000000000001 x3 : ffff1db4008edf00 [ 84.538247] x2 : 0000000000000000 x1 : ffff1db400aa6100 x0 : ffff1db40aad80d0 [ 84.545579] Call trace: [ 84.548101] _opp_table_kref_release+0x188/0x190 [ 84.552842] dev_pm_opp_remove_all_dynamic+0x8c/0xc0 [ 84.557949] qcom_cpufreq_hw_cpu_exit+0x30/0xdc [ 84.562608] cpufreq_offline.isra.0+0x1b4/0x1d8 [ 84.567270] cpuhp_cpufreq_offline+0x10/0x6c [ 84.571663] cpuhp_invoke_callback+0x16c/0x2b0 [ 84.576231] cpuhp_thread_fun+0x190/0x250 [ 84.580353] smpboot_thread_fn+0x12c/0x230 [ 84.584568] kthread+0xfc/0x100 [ 84.587810] ret_from_fork+0x10/0x20 [ 84.591490] irq event stamp: 3482 [ 84.594901] hardirqs last enabled at (3481): [] call_rcu+0x39c/0x50c [ 84.603119] hardirqs last disabled at (3482): [] el1_dbg+0x24/0x8c [ 84.611074] softirqs last enabled at (310): [] _stext+0x410/0x588 [ 84.619028] softirqs last disabled at (305): [] __irq_exit_rcu+0x158/0x174 [ 84.627691] ---[ end trace 0000000000000000 ]--- Fixes: 275157b367f4 ("cpufreq: qcom-cpufreq-hw: Add dcvs interrupt support") Signed-off-by: Dmitry Baryshkov Tested-by: Vladimir Zapolskiy Reviewed-by: Vladimir Zapolskiy Reviewed-by: Bjorn Andersson --- drivers/cpufreq/qcom-cpufreq-hw.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c index 7c1bb002e1c3..fe638e141003 100644 --- a/drivers/cpufreq/qcom-cpufreq-hw.c +++ b/drivers/cpufreq/qcom-cpufreq-hw.c @@ -322,12 +322,18 @@ static void qcom_lmh_dcvs_notify(struct qcom_cpufreq_data *data) opp = dev_pm_opp_find_freq_floor(dev, &freq_hz); if (IS_ERR(opp) && PTR_ERR(opp) == -ERANGE) - dev_pm_opp_find_freq_ceil(dev, &freq_hz); + opp = dev_pm_opp_find_freq_ceil(dev, &freq_hz); - throttled_freq = freq_hz / HZ_PER_KHZ; + if (IS_ERR(opp)) { + dev_warn_ratelimited(dev, "Can't find the OPP for throttling: %pe!\n", opp); + } else { + throttled_freq = freq_hz / HZ_PER_KHZ; + + /* Update thermal pressure (the boost frequencies are accepted) */ + arch_update_thermal_pressure(policy->related_cpus, throttled_freq); - /* Update thermal pressure (the boost frequencies are accepted) */ - arch_update_thermal_pressure(policy->related_cpus, throttled_freq); + dev_pm_opp_put(opp); + } /* * In the unlikely case policy is unregistered do not enable