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usb: gadget: dummy_hcd: move the transfer part into its own function

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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>
This commit is contained in:
Sebastian Andrzej Siewior 2012-01-09 13:14:57 +01:00 committed by Felipe Balbi
parent c688419141
commit a04ce20d9f
1 changed files with 19 additions and 9 deletions
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28
drivers/usb/gadget/dummy_hcd.c
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@ -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 @@ transfer(struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit,
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 @@ transfer(struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit,
}
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;