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-rw-r--r--sys/dev/usb/usbdi.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/sys/dev/usb/usbdi.c b/sys/dev/usb/usbdi.c
index 9070ae51af57..49d675f21d3a 100644
--- a/sys/dev/usb/usbdi.c
+++ b/sys/dev/usb/usbdi.c
@@ -1010,6 +1010,12 @@ usbd_do_request_async(usbd_device_handle dev, usb_device_request_t *req,
const struct usbd_quirks *
usbd_get_quirks(usbd_device_handle dev)
{
+#ifdef DIAGNOSTIC
+ if (dev == NULL) {
+ printf("usbd_get_quirks: dev == NULL\n");
+ return 0;
+ }
+#endif
return (dev->quirks);
}