On Fri, 22 Jun 2012, Ming Lei wrote:

On Thu, Jun 21, 2012 at 9:49 PM, Greg Kroah-Hartman
[off-list ref] wrote:

quoted

We also have not made the rule that a shutdown will complete in a
specific amount of time either, so there is no problem if that takes a
long time as well.

OK, I will submit a new patch which just holds device lock.

Alan, do you have objections on the new one?

No objections.  It should end up being pretty much like one of the 
patches you posted earlier.

Should there be an option for a debug log of each device name just 
before its shutdown routine is called?

Alan Stern