1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index 667e7f9fd877..abf9887322a1 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -270,6 +270,16 @@ static inline int usb_ep_enable(struct usb_ep *ep)
 	if (ep->enabled)
 		return 0;
 
+	/* UDC drivers can't handle endpoints with maxpacket size 0 */
+	if (usb_endpoint_maxp(ep->desc) == 0) {
+		/*
+		 * We should log an error message here, but we can't call
+		 * dev_err() because there's no way to find the gadget
+		 * given only ep.
+		 */
+		return -EINVAL;
+	}
+
 	ret = ep->ops->enable(ep, ep->desc);
 	if (ret)
 		return ret;