2011/4/26 Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>:
>> Ah, ok. Apparently Windows recommends canceling all outstanding
>> transfers before issuing a port reset, which was apparently what the
>> chipset folks were hoping Linux also suggested. Oh well.
>
> I don't know offhand of any drivers that leave URBs active while doing
> a reset. But there's no recommendation about it.
Seems it is not needed, see pg. 38 of ehci spec 1.0:
Note: when software writes this bit(Port Reset bit) to a one, it must also
write a zero to the Port Enable bit.
The ehci hcd has obeyed the rule already, which means downstream
propagation of data is blocked for the port except reset signal.
thanks,
--
Ming Lei
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
