Re: [PATCH 36/78] USB: add power/level sysfs attribute

Am Samstag, 28. April 2007 16:19 schrieb Alan Stern:
> On Fri, 27 Apr 2007, Oliver Neukum wrote:
> 
> > Am Freitag, 27. April 2007 20:55 schrieb Greg Kroah-Hartman:
> > > +       } else if (len == sizeof suspend_string - 1 &&
> > > +                       strncmp(buf, suspend_string, len) == 0) {
> > > +               udev->autosuspend_disabled = 0;
> > > +               udev->autoresume_disabled = 1;
> > > +               rc = usb_external_suspend_device(udev, PMSG_SUSPEND);
> > > +
> > 
> > Hi,
> > 
> > this introduces the possibility of a suspension while user space is
> > doing IO.
> 
> In other words, one user can force a device to suspend while another user 
> is trying to access the device.  True enough.  The second user will get 
> I/O errors.

Will he? What happens if you submit an URB for a suspended device?

	Regards
		Oliver

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