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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>
This commit is contained in:
Yinghai Lu 2013-09-18 21:05:20 -07:00 committed by Rafael J. Wysocki
parent e4a6a29d12
commit 4dea5806d3
1 changed files with 1 additions and 1 deletions
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2
drivers/cpufreq/cpufreq.c
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@ -2104,7 +2104,7 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data)
write_lock_irqsave(&cpufreq_driver_lock, flags);
if (cpufreq_driver) {
write_unlock_irqrestore(&cpufreq_driver_lock, flags);
return -EBUSY;
return -EEXIST;
}
cpufreq_driver = driver_data;
write_unlock_irqrestore(&cpufreq_driver_lock, flags);