usb: udc: store usb_udc pointer in struct usb_gadget
Instead of iterate to find usb_udc according to usb_gadget, this way is easier. Alan Stern suggests this way too: http://marc.info/?l=linux-usb&m=142168496528894&w=2Acked-by: NAlan Stern <stern@rowland.harvard.edu> Signed-off-by: NPeter Chen <peter.chen@freescale.com> Signed-off-by: NFelipe Balbi <balbi@ti.com>
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