From: Thierry Strudel <tstrudel@google.com>
Date: Wed, 15 Jun 2016 00:46:44 +0000 (-0700)
Subject: ANDROID: cpu: send KOBJ_ONLINE event when enabling cpus
X-Git-Tag: firefly_0821_release~176^2~383
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0c718f7d5ba09777a8b861df434199b8874fb3e7;p=firefly-linux-kernel-4.4.55.git

ANDROID: cpu: send KOBJ_ONLINE event when enabling cpus

In case some sysfs nodes needs to be labeled with a different label than
sysfs then user needs to be notified when a core is brought back online.

Signed-off-by: Thierry Strudel <tstrudel@google.com>
Bug: 29359497
Change-Id: I0395c86e01cd49c348fda8f93087d26f88557c91
---

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 37731292f8a1..9ced7c751648 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -627,6 +627,7 @@ void __weak arch_enable_nonboot_cpus_end(void)
 void enable_nonboot_cpus(void)
 {
 	int cpu, error;
+	struct device *cpu_device;
 
 	/* Allow everyone to use the CPU hotplug again */
 	cpu_maps_update_begin();
@@ -644,6 +645,12 @@ void enable_nonboot_cpus(void)
 		trace_suspend_resume(TPS("CPU_ON"), cpu, false);
 		if (!error) {
 			pr_info("CPU%d is up\n", cpu);
+			cpu_device = get_cpu_device(cpu);
+			if (!cpu_device)
+				pr_err("%s: failed to get cpu%d device\n",
+				       __func__, cpu);
+			else
+				kobject_uevent(&cpu_device->kobj, KOBJ_ONLINE);
 			continue;
 		}
 		pr_warn("Error taking CPU%d up: %d\n", cpu, error);