forked from Minki/linux
cpufreq: return EEXIST instead of EBUSY for second registering
On systems that support intel_pstate, acpi_cpufreq fails to load, and udev keeps trying until trace gets filled up and kernel crashes. The root cause is driver return ret from cpufreq_register_driver(), because when some other driver takes over before, it will return EBUSY and then udev will keep trying ... cpufreq_register_driver() should return EEXIST instead so that the system can boot without appending intel_pstate=disable and still use intel_pstate. Signed-off-by: Yinghai Lu <yinghai@kernel.org> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -2104,7 +2104,7 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data)
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write_lock_irqsave(&cpufreq_driver_lock, flags);
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if (cpufreq_driver) {
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write_unlock_irqrestore(&cpufreq_driver_lock, flags);
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return -EBUSY;
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return -EEXIST;
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}
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cpufreq_driver = driver_data;
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write_unlock_irqrestore(&cpufreq_driver_lock, flags);
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