From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
To: Andy Gross <agross@kernel.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Viresh Kumar <viresh.kumar@linaro.org>
Cc: linux-arm-msm@vger.kernel.org, linux-pm@vger.kernel.org,
Thara Gopinath <thara.gopinath@gmail.com>,
kernel test robot <lkp@intel.com>,
Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
Subject: [PATCH v4 3/4] cpufreq: qcom-hw: fix the opp entries refcounting
Date: Sat, 26 Mar 2022 18:51:52 +0300 [thread overview]
Message-ID: <20220326155153.7377-4-dmitry.baryshkov@linaro.org> (raw)
In-Reply-To: <20220326155153.7377-1-dmitry.baryshkov@linaro.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): [<ffffb751c13c3db0>] call_rcu+0x39c/0x50c
[ 84.603119] hardirqs last disabled at (3482): [<ffffb751c236b518>] el1_dbg+0x24/0x8c
[ 84.611074] softirqs last enabled at (310): [<ffffb751c1290410>] _stext+0x410/0x588
[ 84.619028] softirqs last disabled at (305): [<ffffb751c131bf68>] __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 <lkp@intel.com>
Tested-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
Reviewed-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
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
--
2.35.1
next prev parent reply other threads:[~2022-03-26 15:52 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-26 15:51 [PATCH v4 0/4] cpufreq: qcom-hw: Fixes for cpu hotplug support Dmitry Baryshkov
2022-03-26 15:51 ` [PATCH v4 1/4] cpufreq: qcom-hw: drop affinity hint before freeing the IRQ Dmitry Baryshkov
2022-03-26 15:51 ` [PATCH v4 2/4] cpufreq: qcom-hw: fix the race between LMH worker and cpuhp Dmitry Baryshkov
2022-03-31 18:33 ` Bjorn Andersson
2022-03-26 15:51 ` Dmitry Baryshkov [this message]
2022-03-26 15:51 ` [PATCH v4 4/4] cpufreq: qcom-hw: provide online/offline operations Dmitry Baryshkov
2022-03-31 18:34 ` [PATCH v4 0/4] cpufreq: qcom-hw: Fixes for cpu hotplug support Bjorn Andersson
2022-04-01 2:39 ` Viresh Kumar
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