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authorJohn Youn <John.Youn@synopsys.com>2015-12-22 12:23:20 -0800
committerFelipe Balbi <balbi@ti.com>2015-12-22 21:58:26 -0600
commitd9261898a4b2c143c28568dc686a1becfc637a99 (patch)
tree36926864944efeff0392a0005a452c7336579f69 /drivers/usb/dwc3
parent746bfe63bba37ad55956b7377c9af494e7e28929 (diff)
downloadblackbird-op-linux-d9261898a4b2c143c28568dc686a1becfc637a99.tar.gz
blackbird-op-linux-d9261898a4b2c143c28568dc686a1becfc637a99.zip
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: 04c03d10e507 ("usb: dwc3: gadget: handle request->zero") Signed-off-by: John Youn <johnyoun@synopsys.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/dwc3')
-rw-r--r--drivers/usb/dwc3/gadget.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 64b2a8303d33..af023a81a0b0 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -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);
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