linux-kernel - Re: [PATCH] x86: PM: Make APM idle driver initialize polling state

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Message-ID: <20180206182617.GQ5453@intel.com>
Date:   Tue, 6 Feb 2018 20:26:17 +0200
From:   Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        x86 <x86@...nel.org>, Jiri Koshina <jikos@...nel.org>
Subject: Re: [PATCH] x86: PM: Make APM idle driver initialize polling state

On Tue, Feb 06, 2018 at 07:02:58PM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Update the APM driver overlooked by commit 1b39e3f813b4 (cpuidle: Make
> drivers initialize polling state) to initialize the polling state like
> the other cpuidle drivers modified by that commit to prevent cpuidle
> from crashing.
> 
> Fixes: 1b39e3f813b4 (cpuidle: Make drivers initialize polling state)
> Reported-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> Tested-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

And maybe?

Cc: <stable@...r.kernel.org> # v4.14+

> ---
>  arch/x86/kernel/apm_32.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> Index: linux-pm/arch/x86/kernel/apm_32.c
> ===================================================================
> --- linux-pm.orig/arch/x86/kernel/apm_32.c
> +++ linux-pm/arch/x86/kernel/apm_32.c
> @@ -2389,6 +2389,7 @@ static int __init apm_init(void)
>  	if (HZ != 100)
>  		idle_period = (idle_period * HZ) / 100;
>  	if (idle_threshold < 100) {
> +		cpuidle_poll_state_init(&apm_idle_driver);
>  		if (!cpuidle_register_driver(&apm_idle_driver))
>  			if (cpuidle_register_device(&apm_cpuidle_device))
>  				cpuidle_unregister_driver(&apm_idle_driver);
> 

-- 
Ville Syrjälä
Intel OTC