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Date: Mon, 13 Jun 2022 12:06:42 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Viresh Kumar <viresh.kumar@...aro.org>, "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 5.4 129/411] Revert "cpufreq: Fix possible race in cpufreq online error path" From: Viresh Kumar <viresh.kumar@...aro.org> [ 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@...aro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com> Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/cpufreq/cpufreq.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 7ea07764988e..af9f34804862 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1509,6 +1509,8 @@ static int cpufreq_online(unsigned int cpu) for_each_cpu(j, policy->real_cpus) remove_cpu_dev_symlink(policy, get_cpu_device(j)); + up_write(&policy->rwsem); + out_offline_policy: if (cpufreq_driver->offline) cpufreq_driver->offline(policy); @@ -1517,9 +1519,6 @@ static int cpufreq_online(unsigned int cpu) if (cpufreq_driver->exit) cpufreq_driver->exit(policy); - cpumask_clear(policy->cpus); - up_write(&policy->rwsem); - out_free_policy: cpufreq_policy_free(policy); return ret; -- 2.35.1
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