[PATCH] [35/50] i386: Do cpuid_device_create() in CPU_UP_PREPARE instead of CPU_ONLINE.

[Andi Kleen]

From: Akinobu Mita <[EMAIL PROTECTED]>

Do cpuid_device_create() in CPU_UP_PREPARE instead of CPU_ONLINE.

Cc: "H. Peter Anvin" <[EMAIL PROTECTED]>
Signed-off-by: Akinobu Mita <[EMAIL PROTECTED]>
Signed-off-by: Andi Kleen <[EMAIL PROTECTED]>
Cc: Gautham R Shenoy <[EMAIL PROTECTED]>
Cc: Oleg Nesterov <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---

 arch/i386/kernel/cpuid.c |   32 +++++++++++++++++++-------------
 1 file changed, 19 insertions(+), 13 deletions(-)

Index: linux/arch/i386/kernel/cpuid.c
===================================================================
--- linux.orig/arch/i386/kernel/cpuid.c
+++ linux/arch/i386/kernel/cpuid.c
@@ -136,15 +136,18 @@ static const struct file_operations cpui
        .open = cpuid_open,
 };
 
-static int __cpuinit cpuid_device_create(int i)
+static int cpuid_device_create(int cpu)
 {
-       int err = 0;
        struct device *dev;
 
-       dev = device_create(cpuid_class, NULL, MKDEV(CPUID_MAJOR, i), 
"cpu%d",i);
-       if (IS_ERR(dev))
-               err = PTR_ERR(dev);
-       return err;
+       dev = device_create(cpuid_class, NULL, MKDEV(CPUID_MAJOR, cpu),
+                           "cpu%d", cpu);
+       return IS_ERR(dev) ? PTR_ERR(dev) : 0;
+}
+
+static void cpuid_device_destroy(int cpu)
+{
+       device_destroy(cpuid_class, MKDEV(CPUID_MAJOR, cpu));
 }
 
 static int __cpuinit cpuid_class_cpu_callback(struct notifier_block *nfb,
@@ -152,18 +155,21 @@ static int __cpuinit cpuid_class_cpu_cal
                                              void *hcpu)
 {
        unsigned int cpu = (unsigned long)hcpu;
+       int err = 0;
 
        switch (action) {
-       case CPU_ONLINE:
-       case CPU_ONLINE_FROZEN:
-               cpuid_device_create(cpu);
+       case CPU_UP_PREPARE:
+       case CPU_UP_PREPARE_FROZEN:
+               err = cpuid_device_create(cpu);
                break;
+       case CPU_UP_CANCELED:
+       case CPU_UP_CANCELED_FROZEN:
        case CPU_DEAD:
        case CPU_DEAD_FROZEN:
-               device_destroy(cpuid_class, MKDEV(CPUID_MAJOR, cpu));
+               cpuid_device_destroy(cpu);
                break;
        }
-       return NOTIFY_OK;
+       return err ? NOTIFY_BAD : NOTIFY_OK;
 }
 
 static struct notifier_block __cpuinitdata cpuid_class_cpu_notifier =
@@ -200,7 +206,7 @@ static int __init cpuid_init(void)
 out_class:
        i = 0;
        for_each_online_cpu(i) {
-               device_destroy(cpuid_class, MKDEV(CPUID_MAJOR, i));
+               cpuid_device_destroy(i);
        }
        class_destroy(cpuid_class);
 out_chrdev:
@@ -214,7 +220,7 @@ static void __exit cpuid_exit(void)
        int cpu = 0;
 
        for_each_online_cpu(cpu)
-               device_destroy(cpuid_class, MKDEV(CPUID_MAJOR, cpu));
+               cpuid_device_destroy(cpu);
        class_destroy(cpuid_class);
        unregister_chrdev(CPUID_MAJOR, "cpu/cpuid");
        unregister_hotcpu_notifier(&cpuid_class_cpu_notifier);
-
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