linux-kernel - Re: bttv-driver.c:3964: error: void value not ignored as it ought to be

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Date:	Mon, 17 Jul 2006 13:55:49 -0700
From:	"Nish Aravamudan" <nish.aravamudan@...il.com>
To:	"Michael Krufky" <mkrufky@...uxtv.org>
Cc:	"Linux and Kernel Video" <video4linux-list@...hat.com>,
	"Randy Dunlap" <rdunlap@...otime.net>,
	"Andrew Morton" <akpm@...l.org>,
	"Mauro Carvalho Chehab" <mchehab@...radead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Axel Thimm" <Axel.Thimm@...pms.net>
Subject: Re: bttv-driver.c:3964: error: void value not ignored as it ought to be

On 7/17/06, Michael Krufky <mkrufky@...uxtv.org> wrote:
> Axel Thimm wrote:
> > latest hg fails on > 2.6.17 due to video_device_create_file being void
> > but still being asked for a return value in bttv-driver.c
> >
> > linux/drivers/media/video/bt8xx/bttv-driver.c:
> >
> >    3963 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17)
> >    3964         ret = video_device_create_file(btv->video_dev, class_device_attr_card);
> >    3965         if (ret < 0)
> >
> >
> > linux/include/media/v4l2-dev.h:
> >
> >     379 static inline void
> >     380 video_device_create_file(struct video_device *vfd,
> >     381                          struct class_device_attribute *attr)
> >     382 {
> >

<snip>

> Hmmm... This was caused by the "Check all __must_check warnings in
> bttv." patch from Randy Dunlap (cc's from original thread added)
>
> I am aware that this was done for various reasons of sanity checking,
> however, we cannot check the return value of a void ;-)

For the sanity checking, I don't think video_device_create_file()
should be a void function. It probably should return
class_device_create_file()'s return value, no? As it can fail...

Thanks,
Nish
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