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27 March 2024, 02:37:15 UTC
Revision 4985c32ee4241d1aba1beeac72294faa46aaff10 authored by Lan Tianyu on 30 April 2014, 07:46:33 UTC, committed by Rafael J. Wysocki on 30 April 2014, 23:46:43 UTC 
ACPI / processor: Fix failure of loading acpi-cpufreq driver
 
According commit d640113fe (ACPI: processor: fix acpi_get_cpuid for UP
processor),  BIOS may not provide _MAT or MADT tables and acpi_get_apicid()
always returns -1. For these cases, original code will pass apic_id with
vaule of -1 to acpi_map_cpuid() and it will check the acpi_id. If acpi_id
is equal to zero, ignores apic_id and return zero for CPU0.

Commit b981513 (ACPI / scan: bail out early if failed to parse APIC
ID for CPU) changed the behavior. Return ENODEV when find apic_id is
less than zero after calling acpi_get_apicid(). This causes acpi-cpufreq
driver fails to be loaded on some machines. This patch is to fix it.

Fixes: b981513f806d (ACPI / scan: bail out early if failed to parse APIC ID for CPU)
References: https://bugzilla.kernel.org/show_bug.cgi?id=73781
Cc: 3.14+ <stable@vger.kernel.org> # 3.14+
Reported-and-tested-by: KATO Hiroshi <katoh@mikage.ne.jp>
Reported-and-tested-by: Stuart Foster <smf.linux@ntlworld.com>
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1 parent d1db0ee
History
Tip revision: 4985c32ee4241d1aba1beeac72294faa46aaff10 authored by Lan Tianyu on 30 April 2014, 07:46:33 UTC
ACPI / processor: Fix failure of loading acpi-cpufreq driver
Tip revision: 4985c32
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