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Commit a04ce20d authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Felipe Balbi
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usb: gadget: dummy_hcd: move the transfer part into its own function 



This patch moves the part of the code which does the bare transfer into
its function. It is a preparion for the implementation of sg support.

Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent c6884191

drivers/usb/gadget/dummy_hcd.c

+19 −9
Original line number Diff line number Diff line
@@ -1133,6 +1133,23 @@ static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) 
	return rc;

}



static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req,

		u32 len)

{

	void *ubuf, *rbuf;

	int to_host;



	to_host = usb_pipein(urb->pipe);

	rbuf = req->req.buf + req->req.actual;

	ubuf = urb->transfer_buffer + urb->actual_length;



	if (to_host)

		memcpy(ubuf, rbuf, len);

	else

		memcpy(rbuf, ubuf, len);

	return len;

}



/* transfer up to a frame's worth; caller must own lock */

static int

transfer(struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit,
@@ -1164,8 +1181,6 @@ top: 
		if (unlikely (len == 0))

			is_short = 1;

		else {

			char		*ubuf, *rbuf;



			/* not enough bandwidth left? */

			if (limit < ep->ep.maxpacket && limit < len)

				break;
@@ -1180,13 +1195,8 @@ top: 
			}

			is_short = (len % ep->ep.maxpacket) != 0;



			/* else transfer packet(s) */

			ubuf = urb->transfer_buffer + urb->actual_length;

			rbuf = req->req.buf + req->req.actual;

			if (to_host)

				memcpy (ubuf, rbuf, len);

			else

				memcpy (rbuf, ubuf, len);

			len = dummy_perform_transfer(urb, req, len);



			ep->last_io = jiffies;



			limit -= len;