linux-kernel - [PATCH 43/50] intel

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Date:	Tue, 17 Jan 2012 07:21:35 -0500
From:	Len Brown <lenb@...nel.org>
To:	linux-acpi@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Cc:	Shaohua Li <shaohua.li@...el.com>, stable@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Len Brown <len.brown@...el.com>
Subject: [PATCH 43/50] intel_idle: fix API misuse

From: Shaohua Li <shaohua.li@...el.com>

smp_call_function() only lets all other CPUs execute a specific function,
while we expect all CPUs do in intel_idle.  Without the fix, we could have
one cpu which has auto_demotion enabled or has no broadcast timer setup.
Usually we don't see impact because auto demotion just harms power and the
intel_idle init is called in CPU 0, where boradcast timer delivers
interrupt, but this still could be a problem.

Cc: stable@...r.kernel.org
Signed-off-by: Shaohua Li <shaohua.li@...el.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Len Brown <len.brown@...el.com>
---
 drivers/idle/intel_idle.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index 5d2f8e1..af0b4a5 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -394,7 +394,7 @@ static int intel_idle_probe(void)
 	if (boot_cpu_has(X86_FEATURE_ARAT))	/* Always Reliable APIC Timer */
 		lapic_timer_reliable_states = LAPIC_TIMER_ALWAYS_RELIABLE;
 	else {
-		smp_call_function(__setup_broadcast_timer, (void *)true, 1);
+		on_each_cpu(__setup_broadcast_timer, (void *)true, 1);
 		register_cpu_notifier(&setup_broadcast_notifier);
 	}
 
@@ -471,7 +471,7 @@ static int intel_idle_cpuidle_driver_init(void)
 	}
 
 	if (auto_demotion_disable_flags)
-		smp_call_function(auto_demotion_disable, NULL, 1);
+		on_each_cpu(auto_demotion_disable, NULL, 1);
 
 	return 0;
 }
@@ -568,7 +568,7 @@ static void __exit intel_idle_exit(void)
 	cpuidle_unregister_driver(&intel_idle_driver);
 
 	if (lapic_timer_reliable_states != LAPIC_TIMER_ALWAYS_RELIABLE) {
-		smp_call_function(__setup_broadcast_timer, (void *)false, 1);
+		on_each_cpu(__setup_broadcast_timer, (void *)false, 1);
 		unregister_cpu_notifier(&setup_broadcast_notifier);
 	}
 
-- 
1.7.9.rc1

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