linux-kernel - [PATCH 2/2] usb: gadget: webcam: fix V4L2 Kconfig dependency

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Date:   Mon, 11 Dec 2017 12:30:14 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-media@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Ruslan Bilovol <ruslan.bilovol@...il.com>,
        Hannes Reinecke <hare@...e.com>,
        Bart Van Assche <bart.vanassche@....com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] usb: gadget: webcam: fix V4L2 Kconfig dependency

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@...db.de>
---
 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