usbip: give a more helpful error message if vhdi_hcd isn't loaded

Suggest loading vhdi_hcd if it's not loaded to make error message less opaque
Signed-off-by: Galen Guyer <galen@galenguyer.com>
Reviewed-By: Hongren Zheng <i@zenithal.me>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/20230508212120.435329-1-galen@galenguyer.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

tools/usb/usbip/src/usbip_attach.c

@@ -86,7 +86,7 @@ static int import_device(int sockfd, struct usbip_usb_device *udev)
 
 	rc = usbip_vhci_driver_open();
 	if (rc < 0) {
-		err("open vhci_driver");
+		err("open vhci_driver (is vhci_hcd loaded?)");
 		goto err_out;
 	}
 

tools/usb/usbip/src/usbip_detach.c

@@ -50,7 +50,7 @@ static int detach_port(char *port)
 
 	ret = usbip_vhci_driver_open();
 	if (ret < 0) {
-		err("open vhci_driver");
+		err("open vhci_driver (is vhci_hcd loaded?)");
 		return -1;
 	}
 

tools/usb/usbip/src/usbip_port.c

@@ -18,7 +18,7 @@ static int list_imported_devices(void)
 
 	ret = usbip_vhci_driver_open();
 	if (ret < 0) {
-		err("open vhci_driver");
+		err("open vhci_driver (is vhci_hcd loaded?)");
 		goto err_names_free;
 	}