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

[Guan Junxiong]

On 2017/9/20 22:59, Christoph Hellwig wrote:
> 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.
> 

Please consider this patch. At least upstream multipath-tools is using the sysfs state now:
[1] https://git.opensvc.com/gitweb.cgi?p=multipath-tools/.git;a=commitdiff;h=29c3b0446c4d919859f9e87b291563d483aab594
[2] https://git.opensvc.com/gitweb.cgi?p=multipath-tools/.git;a=commitdiff;h=d2561442cc0b444e8a728bac2c1466468816ee9d

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