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From: Perry Yuan <perry.yuan@amd.com>
To: <rafael.j.wysocki@intel.com>, <Mario.Limonciello@amd.com>,
	<ray.huang@amd.com>, <viresh.kumar@linaro.org>
Cc: <Deepak.Sharma@amd.com>, <Nathan.Fontenot@amd.com>,
	<Alexander.Deucher@amd.com>, <Shimmer.Huang@amd.com>,
	<Xiaojian.Du@amd.com>, <Li.Meng@amd.com>, <wyes.karny@amd.com>,
	<linux-pm@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH v9 04/13] cpufreq: amd-pstate: fix kernel hang issue while amd-pstate unregistering
Date: Mon, 26 Dec 2022 00:34:33 +0800	[thread overview]
Message-ID: <20221225163442.2205660-5-perry.yuan@amd.com> (raw)
In-Reply-To: <20221225163442.2205660-1-perry.yuan@amd.com>

In the amd_pstate_adjust_perf(), there is one cpufreq_cpu_get() call to
increase increments the kobject reference count of policy and make it as
busy. Therefore, a corresponding call to cpufreq_cpu_put() is needed to
decrement the kobject reference count back, it will resolve the kernel
hang issue when unregistering the amd-pstate driver and register the
`amd_pstate_epp` driver instance.

Acked-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Perry Yuan <perry.yuan@amd.com>
Cc: stable@vger.kernel.org
---
 drivers/cpufreq/amd-pstate.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 204e39006dda..c17bd845f5fc 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -307,6 +307,7 @@ static void amd_pstate_adjust_perf(unsigned int cpu,
 		max_perf = min_perf;
 
 	amd_pstate_update(cpudata, min_perf, des_perf, max_perf, true);
+	cpufreq_cpu_put(policy);
 }
 
 static int amd_get_min_freq(struct amd_cpudata *cpudata)
-- 
2.34.1


  parent reply	other threads:[~2022-12-25 16:35 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-12-25 16:34 [PATCH v9 00/13] Implement AMD Pstate EPP Driver Perry Yuan
2022-12-25 16:34 ` [PATCH v9 01/13] ACPI: CPPC: Add AMD pstate energy performance preference cppc control Perry Yuan
2023-01-05  5:31   ` Wyes Karny
2023-01-05  6:02     ` Yuan, Perry
2022-12-25 16:34 ` [PATCH v9 02/13] Documentation: amd-pstate: add EPP profiles introduction Perry Yuan
2023-01-04  0:29   ` Limonciello, Mario
2023-01-05  3:18     ` Yuan, Perry
2022-12-25 16:34 ` [PATCH v9 03/13] cpufreq: intel_pstate: use common macro definition for Energy Preference Performance(EPP) Perry Yuan
2023-01-04  0:31   ` Limonciello, Mario
2023-01-05  5:49     ` Yuan, Perry
2023-01-05  5:56       ` Mario Limonciello
2023-01-05  6:14         ` Yuan, Perry
2022-12-25 16:34 ` Perry Yuan [this message]
2022-12-27  2:53   ` [PATCH v9 04/13] cpufreq: amd-pstate: fix kernel hang issue while amd-pstate unregistering Viresh Kumar
2022-12-27  6:32     ` Yuan, Perry
2022-12-25 16:34 ` [PATCH v9 05/13] cpufreq: amd-pstate: optimize driver working mode selection in amd_pstate_param() Perry Yuan
2023-01-04  0:32   ` Limonciello, Mario
2022-12-25 16:34 ` [PATCH v9 06/13] cpufreq: amd-pstate: implement Pstate EPP support for the AMD processors Perry Yuan
2023-01-04  1:05   ` Limonciello, Mario
2023-01-05  6:20     ` Yuan, Perry
2023-01-06  5:22   ` Wyes Karny
2023-01-06  5:58     ` Yuan, Perry
2022-12-25 16:34 ` [PATCH v9 07/13] cpufreq: amd-pstate: implement amd pstate cpu online and offline callback Perry Yuan
2022-12-25 16:34 ` [PATCH v9 08/13] cpufreq: amd-pstate: implement suspend and resume callbacks Perry Yuan
2022-12-27  2:52   ` Viresh Kumar
2023-01-05 15:08     ` Yuan, Perry
2022-12-25 16:34 ` [PATCH v9 09/13] cpufreq: amd-pstate: add driver working mode switch support Perry Yuan
2023-01-04  1:06   ` Limonciello, Mario
2023-01-05  6:02   ` Wyes Karny
2023-01-05  6:57     ` Yuan, Perry
2023-01-05  7:29   ` Wyes Karny
2023-01-05 16:03   ` Wyes Karny
2023-01-06  2:52     ` Yuan, Perry
2023-01-06  3:46   ` Wyes Karny
2022-12-25 16:34 ` [PATCH v9 10/13] Documentation: amd-pstate: add amd pstate driver mode introduction Perry Yuan
2022-12-25 16:34 ` [PATCH v9 11/13] Documentation: introduce amd pstate active mode kernel command line options Perry Yuan
2022-12-25 16:34 ` [PATCH v9 12/13] cpufreq: amd-pstate: convert sprintf with sysfs_emit() Perry Yuan
2022-12-25 16:34 ` [PATCH v9 13/13] Documentation: amd-pstate: introduce new global sysfs attributes Perry Yuan
2023-01-04  0:35   ` Limonciello, Mario
2023-01-05  6:21     ` Yuan, Perry

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