Re: [PATCH V5 8/8] usb : Add usb port's power control attributes

[Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>]

On Sat, 30 Jun 2012, Lan Tianyu wrote:

> > Have you given any thought to locking?  For example, what would happen
> > if the port power policy were changed at the same time as a new device
> > was plugged into the port?
> >
> Do you mean while a new device was enumerating, the port powered off? I 
> guess the enumerating process will fail.

That's what I thought too, but I haven't actually tried it.  Something
strange might happen when two different threads send concurrent
messages to the same hub port.  You might want to do a few experiments.

Alan Stern

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