linux-kernel - Re: [BUG 3.12.rc4] Oops: unable to handle kernel paging request during shutdown

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Date:	Fri, 25 Oct 2013 11:07:40 +0100
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Knut Petersen <Knut_Petersen@...nline.de>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Greg KH <greg@...ah.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	cpufreq@...r.kernel.org, Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [BUG 3.12.rc4] Oops: unable to handle kernel paging request
 during shutdown

On Fri, Oct 25, 2013 at 11:10 AM, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> On Friday, October 25, 2013 11:51:40 AM Rafael J. Wysocki wrote:
>
>         /* don't keep reloading if cpufreq_driver exists */
>         if (cpufreq_get_current_driver())
> -               return 0;
> +               return -EEXIST;
>
>         if (acpi_disabled)
> -               return 0;
> +               return -ENODEV;
>
>         pr_debug("acpi_cpufreq_init\n");

I think:

 - EBUSY is a better error return than EEXIST here/

  - do the ENODEV case first, because claiming something is busy when
you couldn't have used it anyway is kind of stupid)

but yeah, this looks like the right thing. Let's make sure there
aren't any annoying error messages etc printed out as a result of
this, though.

                  Linus
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