[PATCH] nvme: avoid hang on inaccessible paths

[hare@suse.de (Hannes Reinecke)]

On Thu, 31 May 2018 02:10:35 +0300
Sagi Grimberg <sagi@grimberg.me> wrote:

> > And I guess this where the real issue starts.  We should not do
> > block I/O under nvmf_dev_mutex.
> > 
> > James has some work on asynchronous connects pending for FC, so I
> > guess we could look into generalizing that and always exectute the
> > real connect work in a different thread.  
> 
> I still need to ramp up on the ANA patches, but I'd prefer moving
> create_ctrl outside of nvmf_dev_mutex instead of having it async.

We'd need the async patches still, as they provide a way on how we can
call nvme-cli directly from within udev rules.
Without those patches nvme-cli might get stuck (as this issue neatly
proves) and would block udev from processing events.

Cheers,

Hannes