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path: root/drivers/usb/gadget
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Diffstat (limited to 'drivers/usb/gadget')
-rw-r--r--drivers/usb/gadget/imx_udc.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/usb/gadget/imx_udc.c b/drivers/usb/gadget/imx_udc.c
index 239bf8ed9f4..c52a681f376 100644
--- a/drivers/usb/gadget/imx_udc.c
+++ b/drivers/usb/gadget/imx_udc.c
@@ -415,6 +415,13 @@ static int write_packet(struct imx_ep_struct *imx_ep, struct imx_request *req)
u8 *buf;
int length, count, temp;
+ if (unlikely(__raw_readl(imx_ep->imx_usb->base +
+ USB_EP_STAT(EP_NO(imx_ep))) & EPSTAT_ZLPS)) {
+ D_TRX(imx_ep->imx_usb->dev, "<%s> zlp still queued in EP %s\n",
+ __func__, imx_ep->ep.name);
+ return -1;
+ }
+
buf = req->req.buf + req->req.actual;
prefetch(buf);