linux-kernel - Re: [PATCH] media: ttpci: Fix build error without RC

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Date:   Wed, 12 Jun 2019 08:42:55 +0100
From:   Sean Young <sean@...s.org>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     mchehab@...nel.org, tglx@...utronix.de, corbet@....net,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org
Subject: Re: [PATCH] media: ttpci: Fix build error without RC_CORE

On Wed, Jun 12, 2019 at 11:43:10AM +0800, YueHaibing wrote:
> If RC_CORE is not set, building fails:
> 
> drivers/media/pci/ttpci/av7110_ir.o: In function `av7110_ir_init':
> av7110_ir.c:(.text+0x1b0): undefined reference to `rc_allocate_device'
> av7110_ir.c:(.text+0x2c1): undefined reference to `rc_register_device'
> av7110_ir.c:(.text+0x2dc): undefined reference to `rc_free_device'
> 
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Fixes: 71f49a8bf5c5 ("media: ttpci: use rc-core for the IR receiver")
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>

Thank you for spotting this and writing a patch.

> ---
>  drivers/media/pci/ttpci/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/pci/ttpci/Kconfig b/drivers/media/pci/ttpci/Kconfig
> index d96d4fa..b705631 100644
> --- a/drivers/media/pci/ttpci/Kconfig
> +++ b/drivers/media/pci/ttpci/Kconfig
> @@ -7,7 +7,7 @@ config DVB_AV7110
>  	depends on DVB_CORE && PCI && I2C
>  	select TTPCI_EEPROM
>  	select VIDEO_SAA7146_VV
> -	select DVB_AV7110_IR if INPUT_EVDEV=y || INPUT_EVDEV=DVB_AV7110

This says if
 - select DVB_AV7110_IR if INPUT_EVDEV and DVB_AV7110 are both y or m
 - select DVB_AV7110_IR if INPUT_EVDEV=y
   This exists for the case when INPUT_EVDEV=y and DVB_AV7110=m, which is fine

> +	select DVB_AV7110_IR if RC_CORE=DVB_AV7110 && (INPUT_EVDEV=y || INPUT_EVDEV=DVB_AV7110)

That's not exactly the same. For one thing it should not longer depend on
INPUT_EVDEV=y.

Now if DVB_AV7110=m and RC_CORE=y is not allowed which should be (this is
the case in Fedora default kernel config for example).

>  	depends on VIDEO_DEV	# dependencies of VIDEO_SAA7146_VV
>  	select DVB_VES1820 if MEDIA_SUBDRV_AUTOSELECT
>  	select DVB_VES1X93 if MEDIA_SUBDRV_AUTOSELECT
> -- 
> 2.7.4
> 

Thanks,

Sean