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SubjectRe: [patch 10/20] cpu/hotplug: Make target state writeable
Date
On Monday, February 29, 2016 04:49:24 PM Thomas Gleixner wrote:
> On Sun, 28 Feb 2016, Thomas Gleixner wrote:
> >
> > Understood. I'll fix that thing up so that won't happen and I put it on the
> > list of things to look at deeper.
>
> The below delta patch should do what you need, right?

Yup, thanks!

Rafael


> 8<-------------
>
> --- a/kernel/cpu.c
> +++ b/kernel/cpu.c
> @@ -1461,6 +1461,11 @@ static ssize_t write_cpuhp_target(struct
> if (target != CPUHP_OFFLINE && target != CPUHP_ONLINE)
> return -EINVAL;
> #endif
> +
> + ret = lock_device_hotplug_sysfs();
> + if (ret)
> + return ret;
> +
> mutex_lock(&cpuhp_state_mutex);
> sp = cpuhp_get_step(target);
> ret = !sp->name || sp->cant_stop ? -EINVAL : 0;
> @@ -1472,6 +1477,8 @@ static ssize_t write_cpuhp_target(struct
> ret = do_cpu_up(dev->id, target);
> else
> ret = do_cpu_down(dev->id, target);
> +
> + unlock_device_hotplug();
> return ret ? ret : count;
> }

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