diff --git a/drivers/usb/gadget/udc/net2280.c b/drivers/usb/gadget/udc/net2280.c
index 7c5f30cfd24d..02d12c2ad58b 100644
--- a/drivers/usb/gadget/udc/net2280.c
+++ b/drivers/usb/gadget/udc/net2280.c
@@ -3708,6 +3708,17 @@ static int net2280_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		writel(0, &dev->usb->usbctl);
 	}
 
+	/* usb_reinit() dispatches on PLX_LEGACY vs PLX_PCIE and assumes
+	 * every non-legacy chip has llregs mapped (PLX_PCIE branch above).
+	 * A forced/mismatched driver bind can hand us quirks that satisfy
+         * neither, so refuse to proceed rather than dereference NULL.
+         */
+	if (!(dev->quirks & (PLX_LEGACY | PLX_PCIE))) {
+		ep_err(dev, "unsupported device (quirks=%#lx)\n", dev->quirks);
+		retval = -ENODEV;
+		goto done;
+	}
+
 	usb_reset(dev);
 	usb_reinit(dev);