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Revert "cpufreq: Fix possible race in cpufreq online error path"

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[ Upstream commit 85f0e42bd65d01b351d561efb38e584d4c596553 ]

This reverts commit f346e96267cd76175d6c201b40f770c0116a8a04.

The commit tried to fix a possible real bug but it made it even worse.
The fix was simply buggy as now an error out to out_offline_policy or
out_exit_policy will try to release a semaphore which was never taken in
the first place. This works fine only if we failed late, i.e. via
out_destroy_policy.

Fixes: f346e96267cd ("cpufreq: Fix possible race in cpufreq online error path")
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Viresh Kumar
2022-05-09 09:27:37 +05:30
committed by Greg Kroah-Hartman
parent 560dcbe1c7
commit e2786db0a7
1 changed files with 2 additions and 3 deletions
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5
drivers/cpufreq/cpufreq.c
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@@ -1515,6 +1515,8 @@ out_destroy_policy:
for_each_cpu(j, policy->real_cpus) for_each_cpu(j, policy->real_cpus)
remove_cpu_dev_symlink(policy, get_cpu_device(j)); remove_cpu_dev_symlink(policy, get_cpu_device(j));
up_write(&policy->rwsem);
out_offline_policy: out_offline_policy:
if (cpufreq_driver->offline) if (cpufreq_driver->offline)
cpufreq_driver->offline(policy); cpufreq_driver->offline(policy);
@@ -1523,9 +1525,6 @@ out_exit_policy:
if (cpufreq_driver->exit) if (cpufreq_driver->exit)
cpufreq_driver->exit(policy); cpufreq_driver->exit(policy);
cpumask_clear(policy->cpus);
up_write(&policy->rwsem);
out_free_policy: out_free_policy:
cpufreq_policy_free(policy); cpufreq_policy_free(policy);
return ret; return ret;