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Commit 4dea5806d332f91d640d99943db99a5539e832c3

Authored by Yinghai Lu
Committed by Rafael J. Wysocki
1 parent e4a6a29d12
Exists in smarc-imx_3.14.28_1.0.0_ga and in 1 other branch imx_3.14.28_1.0.0_ga

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>

Showing 1 changed file with 1 additions and 1 deletions Side-by-side Diff

drivers/cpufreq/cpufreq.c
Diff comments   View file @ 4dea580
... ... @@ -2104,7 +2104,7 @@
2104 2104 write_lock_irqsave(&cpufreq_driver_lock, flags);
2105 2105 if (cpufreq_driver) {
2106 2106 write_unlock_irqrestore(&cpufreq_driver_lock, flags);
2107   - return -EBUSY;
  2107 + return -EEXIST;
2108 2108 }
2109 2109 cpufreq_driver = driver_data;
2110 2110 write_unlock_irqrestore(&cpufreq_driver_lock, flags);