linux-kernel - Re: [GIT PULL for v4.6-rc1] media updates

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Date:	Wed, 4 May 2016 23:45:40 +0200
From:	Stefan Lippers-Hollmann <s.l-h@....de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Linux Media Mailing List <linux-media@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL for v4.6-rc1] media updates

Hi

On 2016-05-04, Linus Torvalds wrote:
> On Wed, May 4, 2016 at 12:28 PM, Stefan Lippers-Hollmann <s.l-h@....de> wrote:
> >
> > --- a/drivers/media/media-device.c
> > +++ b/drivers/media/media-device.c
> > @@ -875,7 +875,7 @@ void __media_device_usb_init(struct medi
> >                              const char *board_name,
> >                              const char *driver_name)
> >  {
> > -#ifdef CONFIG_USB
> > +#if defined(CONFIG_USB) || defined(CONFIG_USB_MODULE)  
> 
> Ok, that should be fine. Can you verify that it builds and works even
> if USB isn't compiled in, but the media core code is?
> 
> IOW, can you test the
> 
>   CONFIG_USB=m
>   CONFIG_MEDIA_CONTROLLER=y
>   CONFIG_MEDIA_SUPPORT=y

Builds (without warnings in drivers/media/media-device.*) and works fine
as well.

> case? Judging by your oops stack trace, I think you currently have
> MEDIA_SUPPORT=m.

My usual configuration (which, as mentioned in the previous mail, now 
builds and works as well) is:

CONFIG_MEDIA_SUPPORT=m
CONFIG_MEDIA_CONTROLLER=y
CONFIG_USB=m

> Also, I do wonder if we should move that #if to _outside_ the
> function. Because inside the function, things will compile but
> silently not work (like you found), if it is ever mis-used. Outside
> that function, you'll get link-errors if you try to misuse that
> function.

That would probably be the best approach.

Regards
	Stefan Lippers-Hollmann