question about the usb_string_sub

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Hi,
      I'm newbie to usb, and came across an issue when using USB NEC
testing device, this device sends 128 bytes string descriptor, but as
the usb_string_sub tries first to ask for 255 bytes, the transaction
never completes. is it legal for the device to send 128 bytes string?
if yes, should the host controller (orion-ehci) detect data
completion?

saeed
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