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

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@vmware.com>
Signed-off-by: Dan Arai <arai@vmware.com>
Cc: Len Brown <lenb@kernel.org>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>

diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index e48ee4f8749f4afea2e2ec72aff27e05eb30a552..021153f534bf12bbe230190664596b57fb561072 100644 (file)
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -792,7 +792,7 @@ static int acpi_processor_remove(struct acpi_device *device, int type)
        acpi_processor_remove_fs(device);
 
        processors[pr->id] = NULL;
-
+       processor_device_array[pr->id] = NULL;
        kfree(pr);
 
        return 0;