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authorRichard Cochran <rcochran@linutronix.de>2016-07-13 19:16:38 +0200
committerIngo Molnar <mingo@kernel.org>2016-07-15 10:40:24 +0200
commite1272f541c6ad476426ef24b56b4e1d3403db513 (patch)
tree25831e12ad90a127d2bb7c1176090ab7d91ccb51 /drivers/acpi/processor_driver.c
parentvirt: Convert kvm hotplug to state machine (diff)
downloadlinux-e1272f541c6ad476426ef24b56b4e1d3403db513.tar.xz
linux-e1272f541c6ad476426ef24b56b4e1d3403db513.zip
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>
Diffstat (limited to 'drivers/acpi/processor_driver.c')
-rw-r--r--drivers/acpi/processor_driver.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index d2fa8cb82d2b..eecdb196b2d1 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;