From: Yinghai Lu <yinghai@kernel.org>
Date: Thu, 19 Sep 2013 04:05:20 +0000 (-0700)
Subject: cpufreq: return EEXIST instead of EBUSY for second registering
X-Git-Tag: v3.12-rc2~7^2^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4dea5806d332f91d640d99943db99a5539e832c3;p=pandora-kernel.git

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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