Am Freitag, 13. Dezember 2002 13:23 schrieb Oliver Kurth:
> int usb_reset_device(struct usb_device *dev)
> {
>
> ...
>
> if (port < 0)
> return -ENOENT;
>
> info("before down(&usb_address0_sem)");
> down(&usb_address0_sem);
> info("after down(&usb_address0_sem)");
>
> The info() messages are set by me.
> I never get the message "after down(&usb_address0_sem)".
>
> I already tried to do up(&usb_address0_sem); before reset, but
> then I get "unresolved symbols".
>
> Suggestions welcome...
OK. It seems that the lockup goes as follows:
usb_hub_events() ->usb_hub_port_connect_change()->[down(&usb_address0_sem)]
->usb_new_device()->usb_find_drivers()->usb_find_interface_driver()->probe()
->usb_reset_device->[down(&usb_address0_sem)] --- BANG, you're dead.
usb_hub_port_connect_change() should drop the semaphore
before usb_new_device(). How to do that? Is doing usb_new_device
several times really necessary?
Regards
Oliver
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