linux-kernel - [BUG cpufreq] Invalid argument on writing to scaling

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Message-ID: <20140801104314.GA741@localhost>
Date:	Fri, 1 Aug 2014 18:43:15 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Prarit Bhargava <prarit@...hat.com>
Cc:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Aaron Lu <aaron.lu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [BUG cpufreq] Invalid argument on writing to scaling_governor

Hi Prarit,

I noticed that commit dbcbfe6aa0d61ae5e13cab43b30802482007c199 ("cpufreq: hold
policy->rwsem for duration of changing governors") will cause this problem:

root@...4 ~# echo performance > /sys/devices/system/cpu/cpu3/cpufreq/scaling_governor
-bash: echo: write error: Invalid argument

root@...4 ~# cat /sys/devices/system/cpu/cpu3/cpufreq/scaling_available_governors
conservative userspace powersave ondemand performance

Thanks,
Fengguang
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