USB stack / configuration 0

[Jay Cornwall]

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.

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)

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?

-- 
Cheers,
Jay

http://www.evilrealms.net/ - Systems Administrator & Developer
http://www.imperial.ac.uk/ - 3rd year CS student