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: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/gadget/dummy_hcd.c b/drivers/usb/gadget/dummy_hcd.c
index 5a21bf5c..61e893a 100644
--- a/drivers/usb/gadget/dummy_hcd.c
+++ b/drivers/usb/gadget/dummy_hcd.c
@@ -1133,6 +1133,23 @@
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 @@
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 @@
}
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;