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| author | Lan Tianyu <tianyu.lan@intel.com> | 2014-04-30 15:46:33 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-05-13 13:32:57 +0200 |
| commit | d79e8d496977266cbae7d14457e2a1e7aeeab78f (patch) | |
| tree | 57c93d164d79cd5a9f461be13941eb0cd8683271 /drivers/cpufreq/pxa3xx-cpufreq.c | |
| parent | 41cc996c022af590ff59971b37572d5a82c95955 (diff) | |
| download | lwn-d79e8d496977266cbae7d14457e2a1e7aeeab78f.tar.gz lwn-d79e8d496977266cbae7d14457e2a1e7aeeab78f.zip | |
ACPI / processor: Fix failure of loading acpi-cpufreq driver
commit 4985c32ee4241d1aba1beeac72294faa46aaff10 upstream.
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
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/cpufreq/pxa3xx-cpufreq.c')
0 files changed, 0 insertions, 0 deletions