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cpu topology: consider sysfs_create_group return value 

Take return value of sysfs_create_group() into account.  That function got
called in case of CPU_ONLINE notification.  Since callbacks are not allowed
to fail on CPU_ONLINE notification do the sysfs group creation on
CPU_UP_PREPARE notification.

Also remember if creation succeeded in a bitmask.  So it's possible to know
whether it's legal to call sysfs_remove_group or not.

In addition some other minor stuff:

- since CPU_UP_PREPARE might fail add CPU_UP_CANCELED handling as well.
- use hotcpu_notifier instead of register_hotcpu_notifier.
- #ifdef code that isn't needed in the !CONFIG_HOTPLUG_CPU case.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Heiko Carstens 2006-11-08 19:46:09 -08:00 committed by Greg Kroah-Hartman
parent 2895353346
commit 06a4bcae1f
1 changed files with 32 additions and 23 deletions
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55
drivers/base/topology.c
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@ -94,54 +94,63 @@ static struct attribute_group topology_attr_group = {
.name = "topology" .name = "topology"
}; };
static cpumask_t topology_dev_map = CPU_MASK_NONE;
/* Add/Remove cpu_topology interface for CPU device */ /* Add/Remove cpu_topology interface for CPU device */
static int __cpuinit topology_add_dev(struct sys_device * sys_dev) static int __cpuinit topology_add_dev(unsigned int cpu)
{ {
return sysfs_create_group(&sys_dev->kobj, &topology_attr_group); int rc;
struct sys_device *sys_dev = get_cpu_sysdev(cpu);
rc = sysfs_create_group(&sys_dev->kobj, &topology_attr_group);
if (!rc)
cpu_set(cpu, topology_dev_map);
return rc;
} }
static int __cpuinit topology_remove_dev(struct sys_device * sys_dev) #ifdef CONFIG_HOTPLUG_CPU
static void __cpuinit topology_remove_dev(unsigned int cpu)
{ {
struct sys_device *sys_dev = get_cpu_sysdev(cpu);
if (!cpu_isset(cpu, topology_dev_map))
return;
cpu_clear(cpu, topology_dev_map);
sysfs_remove_group(&sys_dev->kobj, &topology_attr_group); sysfs_remove_group(&sys_dev->kobj, &topology_attr_group);
return 0;
} }
static int __cpuinit topology_cpu_callback(struct notifier_block *nfb, static int __cpuinit topology_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu) unsigned long action, void *hcpu)
{ {
unsigned int cpu = (unsigned long)hcpu; unsigned int cpu = (unsigned long)hcpu;
struct sys_device *sys_dev; int rc = 0;
sys_dev = get_cpu_sysdev(cpu);
switch (action) { switch (action) {
case CPU_ONLINE: case CPU_UP_PREPARE:
topology_add_dev(sys_dev); rc = topology_add_dev(cpu);
break; break;
case CPU_UP_CANCELED:
case CPU_DEAD: case CPU_DEAD:
topology_remove_dev(sys_dev); topology_remove_dev(cpu);
break; break;
} }
return NOTIFY_OK; return rc ? NOTIFY_BAD : NOTIFY_OK;
} }
#endif
static struct notifier_block __cpuinitdata topology_cpu_notifier =
{
.notifier_call = topology_cpu_callback,
};
static int __cpuinit topology_sysfs_init(void) static int __cpuinit topology_sysfs_init(void)
{ {
int i; int cpu;
int rc;
for_each_online_cpu(i) { for_each_online_cpu(cpu) {
topology_cpu_callback(&topology_cpu_notifier, CPU_ONLINE, rc = topology_add_dev(cpu);
(void *)(long)i); if (rc)
return rc;
} }
hotcpu_notifier(topology_cpu_callback, 0);
register_hotcpu_notifier(&topology_cpu_notifier);
return 0; return 0;
} }
device_initcall(topology_sysfs_init); device_initcall(topology_sysfs_init);