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diff --git a/sys/dev/usb/usb_generic.c b/sys/dev/usb/usb_generic.c
--- a/sys/dev/usb/usb_generic.c
+++ b/sys/dev/usb/usb_generic.c
@@ -2377,12 +2377,10 @@
break;
case USB_IFACE_DRIVER_ACTIVE:
-
n = *u.pint & 0xFF;
-
iface = usbd_get_iface(f->udev, n);
-
- if (iface && iface->subdev)
+ if (iface != NULL && iface->subdev != NULL &&
+ device_is_alive(iface->subdev))
error = 0;
else
error = ENXIO;

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