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

[Roland Dreier]

> 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.

Thanks,
  Roland
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