linux-kernel - [Patch v2] cpufreq: tegra194: fix warning due to missing opp

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Date:   Tue, 29 Aug 2023 14:13:22 +0530
From:   Sumit Gupta <sumitg@...dia.com>
To:     <rafael@...nel.org>, <viresh.kumar@...aro.org>,
        <linux-pm@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <treding@...dia.com>, <jonathanh@...dia.com>, <bbasu@...dia.com>,
        <sumitg@...dia.com>
Subject: [Patch v2] cpufreq: tegra194: fix warning due to missing opp_put

Fix the warning due to missing dev_pm_opp_put() call and hence
wrong refcount value. This causes below warning message when
trying to remove the module.

 Call trace:
  dev_pm_opp_put_opp_table+0x154/0x15c
  dev_pm_opp_remove_table+0x34/0xa0
  _dev_pm_opp_cpumask_remove_table+0x7c/0xbc
  dev_pm_opp_of_cpumask_remove_table+0x10/0x18
  tegra194_cpufreq_exit+0x24/0x34 [tegra194_cpufreq]
  cpufreq_remove_dev+0xa8/0xf8
  subsys_interface_unregister+0x90/0xe8
  cpufreq_unregister_driver+0x54/0x9c
  tegra194_cpufreq_remove+0x18/0x2c [tegra194_cpufreq]
  platform_remove+0x24/0x74
  device_remove+0x48/0x78
  device_release_driver_internal+0xc8/0x160
  driver_detach+0x4c/0x90
  bus_remove_driver+0x68/0xb8
  driver_unregister+0x2c/0x58
  platform_driver_unregister+0x10/0x18
  tegra194_ccplex_driver_exit+0x14/0x1e0 [tegra194_cpufreq]
  __arm64_sys_delete_module+0x184/0x270

Fixes: f41e1442ac5b ("cpufreq: tegra194: add OPP support and set bandwidth")
Signed-off-by: Sumit Gupta <sumitg@...dia.com>
---
 drivers/cpufreq/tegra194-cpufreq.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/cpufreq/tegra194-cpufreq.c b/drivers/cpufreq/tegra194-cpufreq.c
index 88ef5e57ccd0..9d7e1d58f6e5 100644
--- a/drivers/cpufreq/tegra194-cpufreq.c
+++ b/drivers/cpufreq/tegra194-cpufreq.c
@@ -450,6 +450,7 @@ static int tegra_cpufreq_init_cpufreq_table(struct cpufreq_policy *policy,
 		if (IS_ERR(opp))
 			continue;
 
+		dev_pm_opp_put(opp);
 		ret = dev_pm_opp_enable(cpu_dev, pos->frequency * KHZ);
 		if (ret < 0)
 			return ret;
-- 
2.17.1