From patchwork Sat Mar 26 15:51:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Baryshkov X-Patchwork-Id: 554515 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 79F17C4167B for ; Sat, 26 Mar 2022 15:52:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233689AbiCZPxh (ORCPT ); Sat, 26 Mar 2022 11:53:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60004 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233694AbiCZPxg (ORCPT ); Sat, 26 Mar 2022 11:53:36 -0400 Received: from mail-lj1-x234.google.com (mail-lj1-x234.google.com [IPv6:2a00:1450:4864:20::234]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 17CDE13D30 for ; Sat, 26 Mar 2022 08:52:00 -0700 (PDT) Received: by mail-lj1-x234.google.com with SMTP id b43so9308295ljr.10 for ; Sat, 26 Mar 2022 08:51:59 -0700 (PDT) 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=yMc1zE/A8/QUCb1FtTjagGiCgSImVddv9mvDKYNqv0I=; b=Uz6kx32hwE8pOqayjLZLNMtOBlEijXuCQ52gWxFEl1x7BQDHpJp6pg3KnFdMVfyFu5 OMg04yG7OXL137GWYeQz4hCYd1IsNnXsTQl3rsBb9B0LPrIMYO/un8xXztAej+/JdfTm J5Y9RZ++vfIHVREBcOJptKqdDeuF5/ddsIVlq6q1GJAr6NxOMTItpmpQtJWX9shkY7G2 FZeS3RNCvo7JLg0uEvOERUSQDZb1qjFovnhoMFDGeybjjwX7o9nz7NB/63WkQV/iRX2C PPs7xv9THQlAnTLg4PNawM5tYHjHVhQ5wDHaFfQk2FBjv6dBb45JkFbgdUJww0NzLLIf 9ofg== 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=yMc1zE/A8/QUCb1FtTjagGiCgSImVddv9mvDKYNqv0I=; b=sz533VIX/r8g35tpksuHpNvs6rFt6WgsZeNAM1pt+zYyqVIvWYzIx+S+GEbm8jNpVo Q8gosdgvyVSAfuSJawrKfrzmlC8MMHSTDfWY18AzN1v2xtOtlTs29hoZMgrn0gHUKkCw yhZ/9dB737hlzOjDrODjc4qWH4mjJ+OFOZszLcT4zRtiwILEhGNjBhRn/Y3alpKN9sdC iYUWoqB7wHUXZzvAdLy6fOaeU11y5lNGq2oT1xlcuSfB3oeTHevlW/4Us63NFdLnFyTL azkzNz+zsAvvZf8msO3JLLCvjiPO6sSR4GavHPSdprNjO5bv1yHO1bt86groXhPPPWGz xLVw== X-Gm-Message-State: AOAM530lFGugO5smEd4rAS/x9gplKQZpzZTmRUXr2pkQbbTdmEUP/Y/V S8NLrXWqKr4ehNIt7wtnmCr9Rw== X-Google-Smtp-Source: ABdhPJxri4M5kZQrnEP37Jq7Ta7kGOo0dDQTtJj350jVvnpiIScf/nEPSCAmA4g92FxTb75aep0WxA== X-Received: by 2002:a2e:9593:0:b0:249:b90d:2544 with SMTP id w19-20020a2e9593000000b00249b90d2544mr6539830ljh.6.1648309918245; Sat, 26 Mar 2022 08:51:58 -0700 (PDT) Received: from eriador.lumag.spb.ru ([185.24.52.156]) by smtp.gmail.com with ESMTPSA id o17-20020a05651238b100b00443c898b598sm1097992lft.112.2022.03.26.08.51.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 26 Mar 2022 08:51:57 -0700 (PDT) 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 , kernel test robot , Vladimir Zapolskiy Subject: [PATCH v4 3/4] cpufreq: qcom-hw: fix the opp entries refcounting Date: Sat, 26 Mar 2022 18:51:52 +0300 Message-Id: <20220326155153.7377-4-dmitry.baryshkov@linaro.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220326155153.7377-1-dmitry.baryshkov@linaro.org> References: <20220326155153.7377-1-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") Reported-by: kernel test robot Tested-by: Vladimir Zapolskiy Reviewed-by: Vladimir Zapolskiy Reviewed-by: Bjorn Andersson Signed-off-by: Dmitry Baryshkov --- 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 d39a0ef9ea45..db67daed99a3 100644 --- a/drivers/cpufreq/qcom-cpufreq-hw.c +++ b/drivers/cpufreq/qcom-cpufreq-hw.c @@ -305,12 +305,18 @@ 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(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