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| author | Shaohua Li <shaohua.li@intel.com> | 2012-01-10 15:48:19 -0800 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2012-01-17 05:15:36 -0500 |
| commit | 39a74fdedd1c1461d6fb6d330b5266886513c98f (patch) | |
| tree | f5b2e18a41684dfa8df7aa24015576236f1f7d8d /drivers/idle | |
| parent | 805a6af8dba5dfdd35ec35dc52ec0122400b2610 (diff) | |
| download | linux-39a74fdedd1c1461d6fb6d330b5266886513c98f.tar.gz linux-39a74fdedd1c1461d6fb6d330b5266886513c98f.tar.bz2 linux-39a74fdedd1c1461d6fb6d330b5266886513c98f.zip | |
intel_idle: fix API misuse
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@vger.kernel.org
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/idle')
| -rw-r--r-- | 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 5d2f8e13cf0e..af0b4a5d52f2 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); } |