linux-kernel - Re: [build bug] uvc_status_cleanup(): undefined reference to `input_unregister

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Message-Id: <200902100144.22532.laurent.pinchart@skynet.be>
Date:	Tue, 10 Feb 2009 01:44:22 +0100
From:	Laurent Pinchart <laurent.pinchart@...net.be>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [build bug] uvc_status_cleanup(): undefined reference to `input_unregister_device'

Hi Ingo,

On Sunday 08 February 2009 15:58:35 Ingo Molnar wrote:
> Hi, havent seen this reported on lkml yet.
>
> -tip testing found that certain (user-reachable) Kconfig combinations
> can cause this build failure on latest mainline:
>
>  drivers/built-in.o: In function `uvc_status_cleanup':
>  (.text+0x221cca): undefined reference to `input_unregister_device'
>  drivers/built-in.o: In function `uvc_status_init':
>  (.text+0x221d4c): undefined reference to `input_allocate_device'
>  drivers/built-in.o: In function `uvc_status_init':
>  (.text+0x221db3): undefined reference to `input_free_device'
>  drivers/built-in.o: In function `uvc_status_init':
>  (.text+0x221ec6): undefined reference to `input_register_device'
>  drivers/built-in.o: In function `uvc_status_complete':
>  uvc_status.c:(.text+0x2222ec): undefined reference to `input_event'
>
> triggered on v2.6.29-rc3-697-gae1a25d. The problem is this combination:
>
>  CONFIG_INPUT=m
>  CONFIG_USB_VIDEO_CLASS=y
>  CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV=y

Thanks for the report. The following patch should fix the issue.

diff --git a/drivers/media/video/uvc/Kconfig b/drivers/media/video/uvc/Kconfig
index c2d9760..0dbe7b9 100644
--- a/drivers/media/video/uvc/Kconfig
+++ b/drivers/media/video/uvc/Kconfig
@@ -9,7 +9,7 @@ config USB_VIDEO_CLASS
 config USB_VIDEO_CLASS_INPUT_EVDEV
        bool "UVC input events device support"
        default y
-       depends on USB_VIDEO_CLASS && INPUT
+       depends on USB_VIDEO_CLASS && (INPUT = y || INPUT = USB_VIDEO_CLASS)
        ---help---
          This option makes USB Video Class devices register an input device
          to report button events.

I'm not completely satisfied with this though, as the 
USB_VIDEO_CLASS_INPUT_EVDEV completely disappears from the configuration menu 
if INPUT is set to 'm' and USB_VIDEO_CLASS to 'y'. Being no Kconfig guru, I'd 
appreciate if someone could help me to find a nicer fix (if that's possible at 
all).

Laurent Pinchart

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