USB stack / configuration 0
Bernd Walter
ticso at cicely12.cicely.de
Tue Jan 6 00:17:57 PST 2004
On Tue, Jan 06, 2004 at 12:43:20AM +0000, Jay Cornwall wrote:
> Hi
>
> I've just finished a patch to alleviate several panics in the ugen driver
> (related to devfs issues and setting a USB device's configuration to
> USB_UNCONFIG_NO). I'm about to submit to freebsd-current@, but I need to
> clarify something first.
Sounds great!
> When setting a USB device to configuration number USB_UNCONFIG_NO (i.e. 0),
> the device goes into an unconfigured state with an invalid dev->cdesc. How
> does one then leave this unconfigured state and reconfigure the device to
> accept configuration changes? (all USB_SET_CONFIG changes are currently
> refused after going into configuration 0 - I'm not sure if this is the
> desired behaviour or a bug)
I have to read the docs first bevor making a qualified comment about
this.
> All I can think of is unplugging/plugging the device back in. In which
> case, why would we want to let users set USB_UNCONFIG_NO in the first place?
You can always reset the hub port.
Nevertheless USB_UNCONFIG_NO shouldn't be allowed IMO - it can easily
happen by accident.
--
B.Walter BWCT http://www.bwct.de
ticso at bwct.de info at bwct.de
More information about the freebsd-hackers
mailing list