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Subject[tip:smp/hotplug] ACPI/processor: Avoid STARTING/DYING actions in a more logical way
Commit-ID:  e1272f541c6ad476426ef24b56b4e1d3403db513
Gitweb: http://git.kernel.org/tip/e1272f541c6ad476426ef24b56b4e1d3403db513
Author: Richard Cochran <rcochran@linutronix.de>
AuthorDate: Wed, 13 Jul 2016 17:16:38 +0000
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Fri, 15 Jul 2016 10:40:24 +0200

ACPI/processor: Avoid STARTING/DYING actions in a more logical way

As part of the hotplug cleanup, the CPU_STARTING/DYING actions are going
away soon. This driver needlessly uses those two macro, and so this patch
replaces that code with something more sensible.

Commit:

8da8373447d6a57a5a9f55233d35beb15d92d0d2 ("ACPI / processor: Fix STARTING/DYING action in acpi_cpu_soft_notify()")

added checks for those two actions, because the notification callback can
sleep, causing a hung CPU. This patch instead checks for the ONLINE/DEAD
actions, which are the ones that are handled by the driver in the first
place.

Signed-off-by: Richard Cochran <rcochran@linutronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Len Brown <lenb@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-acpi@vger.kernel.org
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153335.964962885@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
drivers/acpi/processor_driver.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index d2fa8cb..eecdb19 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -118,12 +118,13 @@ static int acpi_cpu_soft_notify(struct notifier_block *nfb,
struct acpi_device *device;
action &= ~CPU_TASKS_FROZEN;

- /*
- * CPU_STARTING and CPU_DYING must not sleep. Return here since
- * acpi_bus_get_device() may sleep.
- */
- if (action == CPU_STARTING || action == CPU_DYING)
+ switch (action) {
+ case CPU_ONLINE:
+ case CPU_DEAD:
+ break;
+ default:
return NOTIFY_DONE;
+ }

if (!pr || acpi_bus_get_device(pr->handle, &device))
return NOTIFY_DONE;
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