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

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Date:   Tue, 06 Feb 2018 19:02:58 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux PM <linux-pm@...r.kernel.org>
Cc:     Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>,
        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>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: PM: Make APM idle driver initialize polling state

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>
---
 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);