Hi, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> writes: >> So I am not sure how the Gadget driver can figure out that it needs to >> usb_ep_queue() another request for status stage when handling the >> no-data control? > > Gadget drivers already queue status-stage requests for no-data > control-OUT requests. The difficulty comes when you want to handle an > IN request or an OUT request with a data stage. I don't see a difficulty there. Gadget driver will see wLength and notice it needs both data and status stages, then it does: usb_ep_queue(ep0, data_req, GFP_KERNEL); usb_ep_queue(ep0, status_req, GFP_KERNEL); Just needs to prepare both requests and queue them both ahead of time. UDC drivers should hold both requests in their own private list and process one at a time. -- balbi -- 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
