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cpufreq: powernv: Fix bugs in powernv_cpufreq_{init/exit}

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Unregister the notifiers if cpufreq_driver_register() fails in
powernv_cpufreq_init(). Re-arrange the unregistration and cleanup routines
in powernv_cpufreq_exit() to free all the resources after the driver
has unregistered.

Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Shilpasri G Bhat 2016-02-26 16:06:51 +05:30 committed by Rafael J. Wysocki
parent f05c966585
commit c5e29ea7ac
1 changed files with 29 additions and 11 deletions
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40
drivers/cpufreq/powernv-cpufreq.c
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@ -595,6 +595,19 @@ static int init_chip_info(void)
return ret;
}
static inline void clean_chip_info(void)
{
kfree(chips);
kfree(core_to_chip_map);
}
static inline void unregister_all_notifiers(void)
{
opal_message_notifier_unregister(OPAL_MSG_OCC,
&powernv_cpufreq_opal_nb);
unregister_reboot_notifier(&powernv_cpufreq_reboot_nb);
}
static int __init powernv_cpufreq_init(void)
{
int rc = 0;
@ -605,30 +618,35 @@ static int __init powernv_cpufreq_init(void)
/* Discover pstates from device tree and init */
rc = init_powernv_pstates();
if (rc) {
pr_info("powernv-cpufreq disabled. System does not support PState control\n");
return rc;
}
if (rc)
goto out;
/* Populate chip info */
rc = init_chip_info();
if (rc)
return rc;
goto out;
register_reboot_notifier(&powernv_cpufreq_reboot_nb);
opal_message_notifier_register(OPAL_MSG_OCC, &powernv_cpufreq_opal_nb);
return cpufreq_register_driver(&powernv_cpufreq_driver);
rc = cpufreq_register_driver(&powernv_cpufreq_driver);
if (!rc)
return 0;
pr_info("Failed to register the cpufreq driver (%d)\n", rc);
unregister_all_notifiers();
clean_chip_info();
out:
pr_info("Platform driver disabled. System does not support PState control\n");
return rc;
}
module_init(powernv_cpufreq_init);
static void __exit powernv_cpufreq_exit(void)
{
unregister_reboot_notifier(&powernv_cpufreq_reboot_nb);
opal_message_notifier_unregister(OPAL_MSG_OCC,
&powernv_cpufreq_opal_nb);
kfree(chips);
kfree(core_to_chip_map);
cpufreq_unregister_driver(&powernv_cpufreq_driver);
unregister_all_notifiers();
clean_chip_info();
}
module_exit(powernv_cpufreq_exit);