Re: [PATCH] Revert "driver core: synchronize device shutdown"

[Greg Kroah-Hartman]

On Tue, Mar 04, 2014 at 08:15:36PM -0800, Roland Dreier wrote:
> > Hm, no one seems to have said anything for the past 5 years about this.
> 
> It definitely is hard to hit -- you have to do "shutdown" or "reboot"
> right as something schedules async work.  In our case we have some
> systems with a large and slightly flaky SAS fabric, so there's a
> constant level of re-probing SCSI disks, and we occasionally see
> reboots hanging due to waiting for never-finishing sd probe async
> work.
> 
> AFAICT the synchronization does nothing useful and is just a remnant
> of a patch series where the real meat didn't get applied.  But of
> course it would be great if Shaohua could confirm my understanding.

Shaohua's email address seems to now bounce :(

Arjan, any thoughts?

greg k-h
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