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x86/hwmon: fix initialization of coretemp 

Using cpuid_eax() to determine feature availability on other than
the current CPU is invalid. And feature availability should also be
checked in the hotplug code path.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Cc: Rudolf Marek <r.marek@assembler.cz>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
This commit is contained in:
Jan Beulich 2010-09-23 22:21:34 -07:00 committed by Guenter Roeck
parent d172132f35
commit a46590533a
3 changed files with 15 additions and 16 deletions
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1
arch/x86/include/asm/cpufeature.h
View File

@ -168,6 +168,7 @@
#define X86_FEATURE_XSAVEOPT (7*32+ 4) /* Optimized Xsave */
#define X86_FEATURE_PLN (7*32+ 5) /* Intel Power Limit Notification */
#define X86_FEATURE_PTS (7*32+ 6) /* Intel Package Thermal Status */
#define X86_FEATURE_DTS (7*32+ 7) /* Digital Thermal Sensor */
/* Virtualization flags: Linux defined, word 8 */
#define X86_FEATURE_TPR_SHADOW (8*32+ 0) /* Intel TPR Shadow */

1
arch/x86/kernel/cpu/scattered.c
View File

@ -31,6 +31,7 @@ void __cpuinit init_scattered_cpuid_features(struct cpuinfo_x86 *c)
const struct cpuid_bit *cb;
static const struct cpuid_bit __cpuinitconst cpuid_bits[] = {
{ X86_FEATURE_DTS, CR_EAX, 0, 0x00000006, 0 },
{ X86_FEATURE_IDA, CR_EAX, 1, 0x00000006, 0 },
{ X86_FEATURE_ARAT, CR_EAX, 2, 0x00000006, 0 },
{ X86_FEATURE_PLN, CR_EAX, 4, 0x00000006, 0 },

29
drivers/hwmon/coretemp.c
View File

@ -423,9 +423,18 @@ static int __cpuinit coretemp_device_add(unsigned int cpu)
int err;
struct platform_device *pdev;
struct pdev_entry *pdev_entry;
#ifdef CONFIG_SMP
struct cpuinfo_x86 *c = &cpu_data(cpu);
#endif
/*
* CPUID.06H.EAX[0] indicates whether the CPU has thermal
* sensors. We check this bit only, all the early CPUs
* without thermal sensors will be filtered out.
*/
if (!cpu_has(c, X86_FEATURE_DTS)) {
printk(KERN_INFO DRVNAME ": CPU (model=0x%x)"
" has no thermal sensor.\n", c->x86_model);
return 0;
}
mutex_lock(&pdev_list_mutex);
@ -527,20 +536,8 @@ static int __init coretemp_init(void)
if (err)
goto exit;
for_each_online_cpu(i) {
struct cpuinfo_x86 *c = &cpu_data(i);
/*
* CPUID.06H.EAX[0] indicates whether the CPU has thermal
* sensors. We check this bit only, all the early CPUs
* without thermal sensors will be filtered out.
*/
if (c->cpuid_level >= 6 && (cpuid_eax(0x06) & 0x01))
coretemp_device_add(i);
else {
printk(KERN_INFO DRVNAME ": CPU (model=0x%x)"
" has no thermal sensor.\n", c->x86_model);
}
}
for_each_online_cpu(i)
coretemp_device_add(i);
#ifndef CONFIG_HOTPLUG_CPU
if (list_empty(&pdev_list)) {