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| author | Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> | 2013-08-06 19:11:11 +0900 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-08-07 22:18:53 +0200 |
| commit | 1e385f6f97b8ab39e16a0956a1951e19a9376bab (patch) | |
| tree | b29db1218f6dc709702b641fdc1f48fccaf04cc2 /drivers/acpi/acpi_processor.c | |
| parent | 007ccfcf89401e764c33965b739310d86a94626d (diff) | |
| download | lwn-1e385f6f97b8ab39e16a0956a1951e19a9376bab.tar.gz lwn-1e385f6f97b8ab39e16a0956a1951e19a9376bab.zip | |
ACPI / processor: move try_offline_node() after acpi_unmap_lsapic()
try_offline_node() checks that all CPUs associated with the given
node have been removed by using cpu_present_bits. If all cpus
related to that node have been removed, try_offline_node() clears
the node information.
However, try_offline_node() called from acpi_processor_remove() never
clears the node information. For disabling cpu_present_bits,
acpi_unmap_lsapic() needs be called. Yet, acpi_unmap_lsapic() is
called after try_offline_node() has run. So when try_offline_node()
runs, the CPU's cpu_present_bits is always set.
Fix the issue by moving try_offline_node() after acpi_unmap_lsapic().
The problem fixed here was uncovered by commit cecdb19 "ACPI / scan:
Change the implementation of acpi_bus_trim()".
[rjw: Changelog]
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Acked-by: Toshi Kani <toshi.kani@hp.com>
Cc: 3.9+ <stable@vger.kernel.org> # 3.9+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/acpi_processor.c')
| -rw-r--r-- | drivers/acpi/acpi_processor.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c index fd6c51cc3acb..5a74a9c1e42c 100644 --- a/drivers/acpi/acpi_processor.c +++ b/drivers/acpi/acpi_processor.c @@ -451,7 +451,6 @@ static void acpi_processor_remove(struct acpi_device *device) /* Clean up. */ per_cpu(processor_device_array, pr->id) = NULL; per_cpu(processors, pr->id) = NULL; - try_offline_node(cpu_to_node(pr->id)); /* Remove the CPU. */ get_online_cpus(); @@ -459,6 +458,8 @@ static void acpi_processor_remove(struct acpi_device *device) acpi_unmap_lsapic(pr->id); put_online_cpus(); + try_offline_node(cpu_to_node(pr->id)); + out: free_cpumask_var(pr->throttling.shared_cpu_map); kfree(pr); |