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usb: dwc3: gadget: don't send extra ZLP 

If the request->length is zero, a ZLP should already be sent due to that
and another ZLP is not needed to terminate the transfer.

Fixes: 04c03d10e5 ("usb: dwc3: gadget: handle request->zero")
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
John Youn 2015-12-22 12:23:20 -08:00 committed by Felipe Balbi
parent 746bfe63bb
commit d9261898a4
1 changed files with 2 additions and 1 deletions
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3
drivers/usb/dwc3/gadget.c
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@ -1203,7 +1203,8 @@ static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request,
* extra usb_request ourselves so that it gets handled the same way as
* any other request.
*/
if (ret == 0 && request->zero && (request->length % ep->maxpacket == 0))
if (ret == 0 && request->zero && request->length &&
(request->length % ep->maxpacket == 0))
ret = __dwc3_gadget_ep_queue_zlp(dwc, dep);
spin_unlock_irqrestore(&dwc->lock, flags);