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ACPI / scan: bail out early if failed to parse APIC ID for CPU

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Enhance ACPI CPU hotplug driver to print clear error message and
bail out early if BIOS returns wrong value in ACPI MADT table or
_MAT method. Otherwise it will add the CPU device even if failed
to get APIC ID and fails any operations against sysfs interface:
/sys/devices/system/cpu/cpux/online

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Jiang Liu 2014-01-09 16:15:19 +08:00 committed by Rafael J. Wysocki
parent d6e0a2dd12
commit b981513f80
1 changed files with 14 additions and 10 deletions
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24
drivers/acpi/acpi_processor.c
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@ -212,7 +212,7 @@ static int acpi_processor_get_info(struct acpi_device *device)
union acpi_object object = { 0 };
struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
struct acpi_processor *pr = acpi_driver_data(device);
int cpu_index, device_declaration = 0;
int apic_id, cpu_index, device_declaration = 0;
acpi_status status = AE_OK;
static int cpu0_initialized;
unsigned long long value;
@ -258,18 +258,21 @@ static int acpi_processor_get_info(struct acpi_device *device)
device_declaration = 1;
pr->acpi_id = value;
}
pr->apic_id = acpi_get_apicid(pr->handle, device_declaration,
pr->acpi_id);
cpu_index = acpi_map_cpuid(pr->apic_id, pr->acpi_id);
/* Handle UP system running SMP kernel, with no LAPIC in MADT */
if (!cpu0_initialized && (cpu_index == -1) &&
(num_online_cpus() == 1)) {
cpu_index = 0;
apic_id = acpi_get_apicid(pr->handle, device_declaration, pr->acpi_id);
if (apic_id < 0) {
acpi_handle_err(pr->handle, "failed to get CPU APIC ID.\n");
return -ENODEV;
}
pr->apic_id = apic_id;
cpu0_initialized = 1;
cpu_index = acpi_map_cpuid(pr->apic_id, pr->acpi_id);
if (!cpu0_initialized) {
cpu0_initialized = 1;
/* Handle UP system running SMP kernel, with no LAPIC in MADT */
if ((cpu_index == -1) && (num_online_cpus() == 1))
cpu_index = 0;
}
pr->id = cpu_index;
/*
@ -282,6 +285,7 @@ static int acpi_processor_get_info(struct acpi_device *device)
if (ret)
return ret;
}
/*
* On some boxes several processors use the same processor bus id.
* But they are located in different scope. For example: