Re: USB Disconnect due to OVER current change with wireless ralink device RT3572

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On Fri, 22 Oct 2010, Greg KH wrote:

> On Fri, Oct 22, 2010 at 02:53:07PM +0530, suman wrote:
> > Hello all
> > 
> > I develop wifi support over USB Bus over mobile type device. It is to
> > connect with ralink 8572 device, I do not think it is problem with
> > this driver as i check with another device ( not mobile device). I
> > work on 2.6.28, my mobile device is embedded and i cannot change OS
> > with latest kernel.
> 
> Why can't you change your kernel?  What is preventing this?  Is it a
> vendor-provided kernel?  If so, please work with them.
> 
> If you are relying on out-of-tree code, please work with the providers
> of that to get it upstream.
> 
> And finally, you do realize just how old the 2.6.28 kernel is, right?
> 
> I think you just might be on your own here, unless you can reproduce the
> problem on the 2.6.36 kernel.

Even that probably won't help, since overcurrent is a hardware problem.  
Evidently the ralink device wants to draw more power than the mobile 
device is capable of providing.  Adding a powered hub might help.

Alan Stern

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