On Thursday 19 July 2012 16:21:38 Lan Tianyu wrote:
> On 2012年07月19日 14:37, Oliver Neukum wrote:
> > Unloading the driver is a user space issue.
> > But you are right there is a missing case
> hi all:
> I have a question About device which needs a firmware when connected.
> If the port powered off when it was suspend, the port would power on
> when system try to access the device. What happen if try to resume the device,
> guess it will fail. usb core would disconnect the device and renumerate the
> device.
Yes. That's how reset_resume() works.
> The driver loaded again with firmware and the device still could work, is
> Right?
No. All settings user space has done will be lost.
> I have no a such device to do test. Just from guess. The point is
> whether
> resuming the device without loading firmware will fail.
It must. Interfaces can vanish and the device class can change.
There's nothing to remain bound to.
Regards
Oliver
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