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x86, hwmon: Fix unsafe smp_processor_id() in thermal_throttle_add_dev 

Fix BUG: using smp_processor_id() in preemptible thermal_throttle_add_dev.
We know the cpu number when calling thermal_throttle_add_dev, so we can
remove smp_processor_id call in thermal_throttle_add_dev by supplying
the cpu number as argument.

This should resolve kernel bugzilla 16615/16629.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
LKML-Reference: <20100820073634.GB5209@swordfish.minsk.epam.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Joerg Roedel <Joerg.Roedel@amd.com>
Cc: Maciej Rutecki <maciej.rutecki@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Sergey Senozhatsky 2010-08-20 10:36:34 +03:00 committed by H. Peter Anvin
parent 36423a5ed5
commit 51e3c1b558
1 changed files with 5 additions and 4 deletions
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9
arch/x86/kernel/cpu/mcheck/therm_throt.c
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@ -202,10 +202,11 @@ static int therm_throt_process(bool new_event, int event, int level)
#ifdef CONFIG_SYSFS
/* Add/Remove thermal_throttle interface for CPU device: */
static __cpuinit int thermal_throttle_add_dev(struct sys_device *sys_dev)
static __cpuinit int thermal_throttle_add_dev(struct sys_device *sys_dev,
unsigned int cpu)
{
int err;
struct cpuinfo_x86 *c = &cpu_data(smp_processor_id());
struct cpuinfo_x86 *c = &cpu_data(cpu);
err = sysfs_create_group(&sys_dev->kobj, &thermal_attr_group);
if (err)
@ -251,7 +252,7 @@ thermal_throttle_cpu_callback(struct notifier_block *nfb,
case CPU_UP_PREPARE:
case CPU_UP_PREPARE_FROZEN:
mutex_lock(&therm_cpu_lock);
err = thermal_throttle_add_dev(sys_dev);
err = thermal_throttle_add_dev(sys_dev, cpu);
mutex_unlock(&therm_cpu_lock);
WARN_ON(err);
break;
@ -287,7 +288,7 @@ static __init int thermal_throttle_init_device(void)
#endif
/* connect live CPUs to sysfs */
for_each_online_cpu(cpu) {
err = thermal_throttle_add_dev(get_cpu_sysdev(cpu));
err = thermal_throttle_add_dev(get_cpu_sysdev(cpu), cpu);
WARN_ON(err);
}
#ifdef CONFIG_HOTPLUG_CPU