linux-kernel - Re: [PATCH] staging: media: stkwebcam: add USB dependency

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Message-ID: <CAMuHMdU4b4huZR=CMpgW3NzDS2x3O6DJ3mvSqfa68Q3QGmsrfA@mail.gmail.com>
Date:   Tue, 17 Jan 2023 21:30:43 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Arnd Bergmann <arnd@...db.de>,
        Ricardo Ribalda <ribalda@...omium.org>,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org,
        Gaosheng Cui <cuigaosheng1@...wei.com>
Subject: Re: [PATCH] staging: media: stkwebcam: add USB dependency

On Tue, Jan 17, 2023 at 5:58 PM Arnd Bergmann <arnd@...nel.org> wrote:
> From: Arnd Bergmann <arnd@...db.de>
>
> Before the move, this driver had implicit dependencies on both
> CONFIG_USB and MEDIA_SUPPORT, which can be =m even in combination
> with CONFIG_MEDIA_USB_SUPPORT=y, so without the dependency we
> get a link failure when USB is a loadable module but stkwebcam
> is built-in:
>
> arm-linux-gnueabi-ld: drivers/staging/media/deprecated/stkwebcam/stk-webcam.o: in function `stk_camera_probe':
> stk-webcam.c:(.text+0xcbc): undefined reference to `usb_get_dev'
> arm-linux-gnueabi-ld: stk-webcam.c:(.text+0xccc): undefined reference to `usb_get_intf'
> arm-linux-gnueabi-ld: stk-webcam.c:(.text+0xd68): undefined reference to `usb_put_intf'
> arm-linux-gnueabi-ld: stk-webcam.c:(.text+0xd70): undefined reference to `usb_put_dev'
> arm-linux-gnueabi-ld: drivers/staging/media/deprecated/stkwebcam/stk-webcam.o: in function `stk_prepare_iso':
> stk-webcam.c:(.text+0xfcc): undefined reference to `usb_free_urb'
> arm-linux-gnueabi-ld: stk-webcam.c:(.text+0x1010): undefined reference to `usb_alloc_urb'
> arm-linux-gnueabi-ld: stk-webcam.c:(.text+0x10d8): undefined reference to `usb_kill_urb'
>
> Add back the original dependency.
>
> Fixes: 1943fb1e50d1 ("media: staging/media: add a STAGING_MEDIA_DEPRECATED option")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Yeah, those pesky tristate->bool->tristate dependency chains...

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

> --- a/drivers/staging/media/deprecated/stkwebcam/Kconfig
> +++ b/drivers/staging/media/deprecated/stkwebcam/Kconfig
> @@ -3,6 +3,7 @@ config VIDEO_STKWEBCAM
>         tristate "USB Syntek DC1125 Camera support (DEPRECATED)"
>         depends on VIDEO_DEV
>         depends on MEDIA_USB_SUPPORT && MEDIA_CAMERA_SUPPORT
> +       depends on USB && MEDIA_SUPPORT
>         help
>           Say Y here if you want to use this type of camera.
>           Supported devices are typically found in some Asus laptops,

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds