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

[Lan Tianyu <tianyu.lan@xxxxxxxxx>]

On 2012/6/30 23:22, Alan Stern wrote:
> On Sat, 30 Jun 2012, Lan Tianyu wrote:
>
> > > > 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.
> > Ok. I will do some experiments. But I guess it may be hard. Those two
> > operation maybe too quirk to be simultaneous. :)
>
> Add ssleep() calls at the right spots.  Then you can make anything
> happen the way you want.  :-)
Good suggestion. Thanks. I will do.
> > What's concurrent messages? I think even from the two threads, messages
> > will also be processed in the message queue in order. Right?
>
> Yes, they will be.  But even so, messages from one thread might occur
> in between messages from a different thread.
>
> Alan Stern


--
Best Regards
Tianyu Lan
linux kernel enabling team
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