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

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Date:   Wed, 12 Jun 2019 06:37:08 -0300
From:   Mauro Carvalho Chehab <mchehab@...nel.org>
To:     Sean Young <sean@...s.org>
Cc:     YueHaibing <yuehaibing@...wei.com>, 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

Em Wed, 12 Jun 2019 08:42:55 +0100
Sean Young <sean@...s.org> escreveu:

> 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).

My suggestion here is to stop using select here, using, instead
a depends on for DVB_AV7110_IR, e. g. something like (untested):

config DVB_AV7110_IR
	bool
	depends on RC_CORE && DVB_AV7110
	default DVB_AV7110


> 
> >  	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



Thanks,
Mauro