Messages in this thread Patch in this message | | | From | Juri Lelli <> | Subject | [RFC PATCH 17/19] cpufreq: stop checking for cpufreq_driver being present in cpufreq_cpu_get | Date | Mon, 11 Jan 2016 17:35:58 +0000 |
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After cpufreq_driver_lock() is acquired in cpufreq_cpu_get() we are sure we can't race with cpufreq_policy_free() (which is in the path that ends up removing cpufreq_driver). We can thus safely remove check for cpufreq_driver being present (which is a leftover from commit 6eed9404ab3c ("cpufreq: Use rwsem for protecting critical sections")).
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Juri Lelli <juri.lelli@arm.com> --- drivers/cpufreq/cpufreq.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 797bfae..6c9bef7 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -282,15 +282,15 @@ struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu) if (WARN_ON(cpu >= nr_cpu_ids)) return NULL; - /* get the cpufreq driver */ read_lock_irqsave(&cpufreq_driver_lock, flags); - if (cpufreq_driver) { - /* get the CPU */ - policy = cpufreq_cpu_get_raw(cpu); - if (policy) - kobject_get(&policy->kobj); - } + /* + * If we get a policy, cpufreq_policy_free() didn't + * yet run. + */ + policy = cpufreq_cpu_get_raw(cpu); + if (policy) + kobject_get(&policy->kobj); read_unlock_irqrestore(&cpufreq_driver_lock, flags); -- 2.2.2
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