Configuring the USB_G_WEBCAM driver as built-in leads to a link error when CONFIG_VIDEO_V4L2 is a loadable module: drivers/usb/gadget/function/f_uvc.o: In function `uvc_function_setup': f_uvc.c:(.text+0xfe): undefined reference to `v4l2_event_queue' drivers/usb/gadget/function/f_uvc.o: In function `uvc_function_ep0_complete': f_uvc.c:(.text+0x188): undefined reference to `v4l2_event_queue' This changes the Kconfig dependency to disallow that configuration, and force it to be a module in that case as well. This is apparently a rather old bug, but very hard to trigger even in thousands of randconfig builds. Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> --- drivers/usb/gadget/legacy/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/gadget/legacy/Kconfig b/drivers/usb/gadget/legacy/Kconfig index 2d80a9d1d5d9..fbd974965399 100644 --- a/drivers/usb/gadget/legacy/Kconfig +++ b/drivers/usb/gadget/legacy/Kconfig @@ -513,7 +513,7 @@ endif # or video class gadget drivers), or specific hardware, here. config USB_G_WEBCAM tristate "USB Webcam Gadget" - depends on VIDEO_DEV + depends on VIDEO_V4L2 select USB_LIBCOMPOSITE select VIDEOBUF2_VMALLOC select USB_F_UVC -- 2.9.0
