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cpufreq: kirkwood: fix possible object reference leak 

The call to of_get_child_by_name returns a node pointer with refcount
incremented thus it must be explicitly decremented after the last
usage.

Detected by coccinelle with the following warnings:
./drivers/cpufreq/kirkwood-cpufreq.c:127:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 118, but without a corresponding object release within this function.
./drivers/cpufreq/kirkwood-cpufreq.c:133:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 118, but without a corresponding object release within this function.

and also do some cleanup:
- of_node_put(np);
- np = NULL;
...
of_node_put(np);

Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Wen Yang 2019-04-01 09:37:50 +08:00 committed by Viresh Kumar
parent ddb64c5db3
commit 7c468966f0
1 changed files with 11 additions and 8 deletions
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19
drivers/cpufreq/kirkwood-cpufreq.c
View File

@ -124,13 +124,14 @@ static int kirkwood_cpufreq_probe(struct platform_device *pdev)
priv.cpu_clk = of_clk_get_by_name(np, "cpu_clk");
if (IS_ERR(priv.cpu_clk)) {
dev_err(priv.dev, "Unable to get cpuclk\n");
return PTR_ERR(priv.cpu_clk);
err = PTR_ERR(priv.cpu_clk);
goto out_node;
}
err = clk_prepare_enable(priv.cpu_clk);
if (err) {
dev_err(priv.dev, "Unable to prepare cpuclk\n");
return err;
goto out_node;
}
kirkwood_freq_table[0].frequency = clk_get_rate(priv.cpu_clk) / 1000;
@ -161,20 +162,22 @@ static int kirkwood_cpufreq_probe(struct platform_device *pdev)
goto out_ddr;
}
of_node_put(np);
np = NULL;
err = cpufreq_register_driver(&kirkwood_cpufreq_driver);
if (!err)
return 0;
if (err) {
dev_err(priv.dev, "Failed to register cpufreq driver\n");
goto out_powersave;
}
dev_err(priv.dev, "Failed to register cpufreq driver\n");
of_node_put(np);
return 0;
out_powersave:
clk_disable_unprepare(priv.powersave_clk);
out_ddr:
clk_disable_unprepare(priv.ddr_clk);
out_cpu:
clk_disable_unprepare(priv.cpu_clk);
out_node:
of_node_put(np);
return err;