Re: [PATCH] nvme: make controller 'state' sysfs attribute pollable

[Christoph Hellwig]

On Wed, Sep 20, 2017 at 12:40:32PM +0200, Johannes Thumshirn wrote:
> Notify sysfs about changes of a nvme controller so user-space can watch the
> file via poll() or select() in order to react to a state change.

Userspace has no business polling for the state.