acpi: fix "buggy BIOS check" when CPUs are hot removed

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
---------------------

From: Alok Kataria <akataria@xxxxxxxxxx>

upstream commit: ba62b077871a5255e271f4fdae57167651839277

Fixes a BUG in ACPI hotplugging.

processor_device_array[pr->id] needs to be set to NULL when removing a CPU.
Else the "buggy BIOS check" in acpi_processor_start mistakenly fires when a
CPU is removed from the system and then later re-added.

Signed-off-by: Alok N Kataria <akataria@xxxxxxxxxx>
Signed-off-by: Dan Arai <arai@xxxxxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
---
 drivers/acpi/processor_core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -792,7 +792,7 @@ static int acpi_processor_remove(struct 
 	acpi_processor_remove_fs(device);
 
 	processors[pr->id] = NULL;
-
+	processor_device_array[pr->id] = NULL;
 	kfree(pr);
 
 	return 0;

-- 
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