Am Donnerstag, 27. Juni 2002 14:49 schrieb Soewono Effendi:
> Hello there,
>
> after looking around in source codes and searching in mailing list and
> G*gle, I still couldn't find any hints why there exists only one "khubd"
> in USB Stack. Isn't it "better (performance?)" to have one "khubd" for
> each HC? (thinking of multi processor platform) What was the
> design/implementation decision?
Hotpluggings are rare events in comparison. One task is enough,
more would just waste memory. Besides they take BKL and thus
couldn't run in concurrency.
> Is there any informations about "URB lifetime" ? who allocates and
> deallocates it, when one should/shouldn't remove it, etc.
In 2.5 the device driver allocates it. There's usage counting done,
so errornously freeing it is not an issue.
You should not touch it after usb_submit_urb() until
either usb_unlink_urb() returns or the completion handler
is called.
Regards
Oliver
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