[PATCH] nvme: avoid hang on inaccessible paths

[hch@lst.de (Christoph Hellwig)]

On Mon, Jun 04, 2018@03:17:43PM +0300, Sagi Grimberg wrote:
> From udev man:
>
> RUN{type}
>
> ...
>        This can only be used for very short-running foreground tasks.
>        Running an event process for a long period of time may block all
>        further events for this or a dependent device.
>
>        Starting daemons or other long running processes is not appropriate
>        for udev; the forked processes, detached or not, will be
>        unconditionally killed after the event handling has finished.
>
> One way around this is to disown the command from udev shell
> (e.g. $cmd & disown)

Oh well.  Offloading to a workqueue in the kernel to work around
this just doesn't really sound like the proper solution.  Then again
our connect really should not take longer than a reasonable timeout
anyway..