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cpufreq: Make cpufreq_online() call driver->offline() on errors

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[ Upstream commit 3b7180573c250eb6e2a7eec54ae91f27472332ea ]

In the CPU removal path the ->offline() callback provided by the
driver is always invoked before ->exit(), but in the cpufreq_online()
error path it is not, so ->exit() is expected to somehow know the
context in which it has been called and act accordingly.

That is less than straightforward, so make cpufreq_online() invoke
the driver's ->offline() callback, if present, on errors before
->exit() too.

This only potentially affects intel_pstate.

Fixes: 91a12e91dc ("cpufreq: Allow light-weight tear down and bring up of CPUs")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Rafael J. Wysocki 2021-06-22 21:11:39 +02:00 committed by Greg Kroah-Hartman
parent cc0b1776fd
commit 3e33b1329c
1 changed files with 10 additions and 1 deletions
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11
drivers/cpufreq/cpufreq.c
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@ -1368,9 +1368,14 @@ static int cpufreq_online(unsigned int cpu)
goto out_free_policy;
}
/*
* The initialization has succeeded and the policy is online.
* If there is a problem with its frequency table, take it
* offline and drop it.
*/
ret = cpufreq_table_validate_and_sort(policy);
if (ret)
goto out_exit_policy;
goto out_offline_policy;
/* related_cpus should at least include policy->cpus. */
cpumask_copy(policy->related_cpus, policy->cpus);
@ -1513,6 +1518,10 @@ static int cpufreq_online(unsigned int cpu)
up_write(&policy->rwsem);
out_offline_policy:
if (cpufreq_driver->offline)
cpufreq_driver->offline(policy);
out_exit_policy:
if (cpufreq_driver->exit)
cpufreq_driver->exit(policy);