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ACPI / processor: move try_offline_node() after acpi_unmap_lsapic()

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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 <[email protected]>
Acked-by: Toshi Kani <[email protected]>
Cc: 3.9+ <[email protected]> # 3.9+
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Yasuaki Ishimatsu 2013-08-06 19:11:11 +09:00 • committed by Rafael J. Wysocki
commit 1e385f6f97
1 changed files with 2 additions and 1 deletions
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3
drivers/acpi/acpi_processor.c
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@ -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);