On Sun, Jul 18, 2010 at 10:50:32PM -0400, Chen Gong wrote:
> this patch fixes two errors about hotplug. One is for
> hotplug notifier. The other is unnecessary driver unregister.
> Because even none of online cpus supports coretemp, we can't
> assume new onlined cpu doesn't support it either. If related
> driver is unregistered there we have no chance to use coretemp
> from then on.
>
Thinking about this ... I understand the logic, and I think it makes sense.
However, this only applies if CONFIG_HOTPLUG_CPU is defined.
Otherwise, the driver should still be unloaded if there are no sensors.
Guenter
> Signed-off-by: Chen Gong <gong.chen@xxxxxxxxxxxxxxx>
> ---
> drivers/hwmon/coretemp.c | 9 +++------
> 1 files changed, 3 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
> index 05344af..9232c4e 100644
> --- a/drivers/hwmon/coretemp.c
> +++ b/drivers/hwmon/coretemp.c
> @@ -502,10 +502,13 @@ static int __cpuinit coretemp_cpu_callback(struct notifier_block *nfb,
>
> switch (action) {
> case CPU_ONLINE:
> + case CPU_ONLINE_FROZEN:
> case CPU_DOWN_FAILED:
> + case CPU_DOWN_FAILED_FROZEN:
> coretemp_device_add(cpu);
> break;
> case CPU_DOWN_PREPARE:
> + case CPU_DOWN_PREPARE_FROZEN:
> coretemp_device_remove(cpu);
> break;
> }
> @@ -547,10 +550,6 @@ static int __init coretemp_init(void)
> " has no thermal sensor.\n", c->x86_model);
> }
> }
> - if (list_empty(&pdev_list)) {
> - err = -ENODEV;
> - goto exit_driver_unreg;
> - }
>
> #ifdef CONFIG_HOTPLUG_CPU
> register_hotcpu_notifier(&coretemp_cpu_notifier);
> @@ -565,8 +564,6 @@ exit_devices_unreg:
> kfree(p);
> }
> mutex_unlock(&pdev_list_mutex);
> -exit_driver_unreg:
> - platform_driver_unregister(&coretemp_driver);
> exit:
> return err;
> }
> --
> 1.7.2.rc3
>
>
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