Re: [linux-usb-devel] Re: hotplugging to deal with firmware download

[Oliver Neukum <oliver@neukum.name>]

> > > No, this should be done from userspace.
> >
> > Very well then, how ?
> > I see no plan to do it with the present power management system.
>
> I agree.  That's why people are still working on the power management
> system :)

Well, time is not infinite. I doubt the work'll be finished soon enough.

> > The devices are simply assumed to switch from suspended to working
> > in kernel space. Suspended may mean off here.
>
> If "suspended" means off, then the device should start up in the powered
> off state, and re-enumerate as a new usb device on powerup.

That exactly you cannot do. The result is file system corruption,
interfaces assigned wrong adresses, cameras being switched.
You need to retain device<->node correspondences.

> If you _have_ to handle this today, then just leave the firmware within
> the kernel driver, like all of the usb-serial devices have done :)
>
> If you wait a while, the rest of the power management sections of the
> kernel will hopefully come together, allowing the various states of
> shutdown to work properly, and be enumerated by _userspace_ tools.

Shutdown I don't worry about, resumption is anothere matter.

	Regards
		Oliver


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