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Subject[PATCH V2] Driver cpu: update online when cpu_up/down besides sysfs
Date
The current per-cpu offline info won't be updated when we use
any other method besides sysfs to call cpu_up/down.
Thus the cpu/online can't reflect the real online status.

This patch is going to fix the issue introduced by commit
0902a9044fa5b7a0456ea4daacec2c2b3189ba8c (Driver core:
Use generic offline/online for CPU offline/online)

CC: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Neil Zhang <zhangwm@marvell.com>
---
drivers/base/cpu.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)

diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index 006b1bc..9d61824 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -418,10 +418,35 @@ static void __init cpu_dev_register_generic(void)
#endif
}

+static int device_hotplug_notifier(struct notifier_block *nfb,
+ unsigned long action, void *hcpu)
+{
+ unsigned int cpu = (unsigned long)hcpu;
+ struct device *dev = get_cpu_device(cpu);
+ int ret;
+
+ switch (action & ~CPU_TASKS_FROZEN) {
+ case CPU_ONLINE:
+ dev->offline = false;
+ ret = NOTIFY_OK;
+ break;
+ case CPU_DYING:
+ dev->offline = true;
+ ret = NOTIFY_OK;
+ break;
+ default:
+ ret = NOTIFY_DONE;
+ break;
+ }
+
+ return ret;
+}
+
void __init cpu_dev_init(void)
{
if (subsys_system_register(&cpu_subsys, cpu_root_attr_groups))
panic("Failed to register CPU subsystem");

cpu_dev_register_generic();
+ cpu_notifier(device_hotplug_notifier, 0);
}
--
1.7.9.5


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