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authorAkinobu Mita <akinobu.mita@gmail.com>2007-10-18 03:05:14 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-18 14:37:21 -0700
commit881a841f4ae268207c29721532406ad061e41857 (patch)
tree5349a9ccbb8e57cb0c84d6c0cffe979d5f14e6e9
parentc7e38a9c27ced4020d64749400cece4fbad4679e (diff)
cpu hotplug: msr: fix cpu hotplug error handling
Do msr_device_create() in CPU_UP_PREPARE instead of CPU_ONLINE. Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: Gautham R Shenoy <ego@in.ibm.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Andi Kleen <ak@suse.de> Cc: Jan Beulich <jbeulich@novell.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/x86/kernel/msr.c35
1 files changed, 20 insertions, 15 deletions
diff --git a/arch/x86/kernel/msr.c b/arch/x86/kernel/msr.c
index df85c9c1360..e0d5e82e64b 100644
--- a/arch/x86/kernel/msr.c
+++ b/arch/x86/kernel/msr.c
@@ -133,37 +133,42 @@ static const struct file_operations msr_fops = {
.open = msr_open,
};
-static int __cpuinit msr_device_create(int i)
+static int msr_device_create(int cpu)
{
- int err = 0;
struct device *dev;
- dev = device_create(msr_class, NULL, MKDEV(MSR_MAJOR, i), "msr%d",i);
- if (IS_ERR(dev))
- err = PTR_ERR(dev);
- return err;
+ dev = device_create(msr_class, NULL, MKDEV(MSR_MAJOR, cpu),
+ "msr%d", cpu);
+ return IS_ERR(dev) ? PTR_ERR(dev) : 0;
+}
+
+static void msr_device_destroy(int cpu)
+{
+ device_destroy(msr_class, MKDEV(MSR_MAJOR, cpu));
}
static int __cpuinit msr_class_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
unsigned int cpu = (unsigned long)hcpu;
+ int err = 0;
switch (action) {
- case CPU_ONLINE:
- case CPU_ONLINE_FROZEN:
- msr_device_create(cpu);
+ case CPU_UP_PREPARE:
+ case CPU_UP_PREPARE_FROZEN:
+ err = msr_device_create(cpu);
break;
+ case CPU_UP_CANCELED:
+ case CPU_UP_CANCELED_FROZEN:
case CPU_DEAD:
case CPU_DEAD_FROZEN:
- device_destroy(msr_class, MKDEV(MSR_MAJOR, cpu));
+ msr_device_destroy(cpu);
break;
}
- return NOTIFY_OK;
+ return err ? NOTIFY_BAD : NOTIFY_OK;
}
-static struct notifier_block __cpuinitdata msr_class_cpu_notifier =
-{
+static struct notifier_block __cpuinitdata msr_class_cpu_notifier = {
.notifier_call = msr_class_cpu_callback,
};
@@ -196,7 +201,7 @@ static int __init msr_init(void)
out_class:
i = 0;
for_each_online_cpu(i)
- device_destroy(msr_class, MKDEV(MSR_MAJOR, i));
+ msr_device_destroy(i);
class_destroy(msr_class);
out_chrdev:
unregister_chrdev(MSR_MAJOR, "cpu/msr");
@@ -208,7 +213,7 @@ static void __exit msr_exit(void)
{
int cpu = 0;
for_each_online_cpu(cpu)
- device_destroy(msr_class, MKDEV(MSR_MAJOR, cpu));
+ msr_device_destroy(cpu);
class_destroy(msr_class);
unregister_chrdev(MSR_MAJOR, "cpu/msr");
unregister_hotcpu_notifier(&msr_class_cpu_notifier);