Re: crash for ftdi_sio

Oliver Neukum <[email protected]>
Newsgroups gmane.linux.usb.devel
Organization Novell
Message-ID <[email protected]>
Am Donnerstag, 24. Mai 2007 16:13 schrieb Alan Stern:
> On Thu, 24 May 2007, Oliver Neukum wrote:
> 
> > > Am Donnerstag, 24. Mai 2007 14:25 schrieb Sam Liddicott:
> > > Recompiled and:
> > > # CONFIG_USB_SUSPEND is not set
> > > 
> > > Same problem, and still get the:
> > > 
> > > usb usb2: suspend_rh (auto-stop)
> > 
> > Odd, even impossible. Did you replace all USB modules?
> 
> Not at all.  uhci-hcd automatically shuts off (auto-stops) root hubs to
> which no device is connected.  It does this even when
> CONFIG_USB_SUSPEND isn't set, in order to reduce the DMA load.
> 
> It's not clear whether this is connected to Sam's problem.  Yes, usb2
> is stopping, but the FTDI devices are attached to usb1 so in theory it
> shouldn't matter.  In practice, you never know...

I don't believe in coincidencies. It is worth checking out.
If it isn't fixable that way, an usbmon trace will likely be needed.

	Regards
		Oliver

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