linux-kernel - Re: next-20151222 - compile failure in drivers/media/usb/uvc/uvc

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Date:	Wed, 23 Dec 2015 01:07:31 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Mauro Carvalho Chehab <mchehab@....samsung.com>
Cc:	Javier Martinez Canillas <javier@....samsung.com>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: next-20151222 - compile failure in drivers/media/usb/uvc/uvc_driver.c

Hi Mauro,

On Tuesday 22 December 2015 16:33:50 Mauro Carvalho Chehab wrote:
> Em Tue, 22 Dec 2015 20:06:38 +0200 Laurent Pinchart escreveu:
> > On Tuesday 22 December 2015 09:40:43 Javier Martinez Canillas wrote:
> > > On 12/22/2015 07:18 AM, Valdis Kletnieks wrote:
> > > > next-20151222 fails to build for me:
> > > >   CC      drivers/media/usb/uvc/uvc_driver.o
> > > > 
> > > > drivers/media/usb/uvc/uvc_driver.c: In function 'uvc_probe':
> > > > drivers/media/usb/uvc/uvc_driver.c:1941:32: error: 'struct uvc_device'
> > > > has no member named 'mdev'
> > > > 
> > > >   if (media_device_register(&dev->mdev) < 0)
> > > >                                 ^
> > > > 
> > > > scripts/Makefile.build:258: recipe for target
> > > > 'drivers/media/usb/uvc/uvc_driver.o' failed
> > > > 
> > > > 'git blame' points at that line being added in:
> > > > 
> > > > commit 1590ad7b52714fddc958189103c95541b49b1dae
> > > > Author: Javier Martinez Canillas <javier@....samsung.com>
> > > > Date:   Fri Dec 11 20:57:08 2015 -0200
> > > > 
> > > >     [media] media-device: split media initialization and registration
> > > > 
> > > > Not sure what went wrong here.
> > > 
> > > It was my forgetting to test with !CONFIG_MEDIA_CONTROLLER...
> > > 
> > > Anyways, I've already posted a fix for this:
> > > 
> > > https://lkml.org/lkml/2015/12/21/224
> > 
> > Thank you for the fix.
> > 
> > I know this is an unpopular request, but can't we make this MC rework
> > series bisectable ? We're introducing bugs, which is unavoidable given
> > the scope of the change, and I'm really worried about how difficult we'll
> > make it to debug them if we keep piling even compilation fixes on top.
> > 
> > I can spend a day this week rebasing the patches myself if that could
> > help.
> 
> Laurent,
> 
> The problem is that those patches got merged already at media_tree,
> at the media-controller topic branch.
> 
> Any rebase there will break the git copies from all developers that are
> based on it. It will also break the trees at linuxtv.org, since the
> developer trees share objects with media_tree.git, in order to save
> space on the servers.

But that branch hasn't been merged to master, so it doesn't have to be the one 
we send upstream, does it ? I'm willing to spend time working on the patches 
if it can help.

> What we could try to do is to fold them just before sending the pull
> request upstream, as we're using tags for pull requests.
> 
> I'll do that during the merge window, if someone reminds me about
> what patches should be fold. I guess there are only two or three
> patches to be fold, as the only compilation breakages I'm aware are
> the ones related to Javier's patch series that broke media_device
> init from the media devnode creation.

-- 
Regards,

Laurent Pinchart

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