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Date:	Thu, 19 Sep 2013 09:38:32 +0530
From:	Viresh Kumar <>
To:	Yinghai Lu <>
Cc:	"Rafael J. Wysocki" <>,
	"" <>,
	"" <>,
	Linux Kernel Mailing List <>
Subject: Re: [PATCH] cpufreq: return EEXIST instead of EBUSY for second registering

On 19 September 2013 09:35, Yinghai Lu <> wrote:
> System that cpu support intel_pstate, acpi_cpufreq fail to
> load, and udev keep trying until trace get filled up and
> kernel crash.
> The root cause is driver return ret from cpufreq_register_driver
> and when some other driver take over before, it would return
> EBUSY, then udev will keep trying...
> cpufreq_register_driver should return EEXIST instead.
> then system could boot without appending intel_pstate=disable
> and still use intel_pstate.
> Signed-off-by: Yinghai Lu <>

Acked-by: Viresh Kumar <>
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