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From:   Andrey Konovalov <andreyknvl@google.com>
Date:   Fri, 7 Jun 2019 13:44:58 +0200
Message-ID: <CAAeHK+xRHB28N_VUbcCit=81+wKK=A9X3aA4rTa9aShy7b2Bnw@mail.gmail.com>
Subject: Pass transfer_buffer to gadget drivers
To:     Alan Stern <stern@rowland.harvard.edu>
Cc:     USB list <linux-usb@vger.kernel.org>,
        Alexander Potapenko <glider@google.com>,
        Dmitry Vyukov <dvyukov@google.com>
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Hi Alan,

I've noticed that when the host performs a control request,
urb->transfer_buffer/transfer_buffer_length are not passed to the
gadget drivers via the setup() call, the only thing that is passed is
the usb_ctrlrequest struct. Is there a way to get the transfer_buffer
from within a gadget driver? If not, what approach would the best to
implement this?

Thanks!