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Date:   Tue, 27 Mar 2018 09:53:32 +0200
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Seung-Woo Kim <sw0312.kim@samsung.com>
Cc:     mchehab@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: Linux 3.18.102
Message-ID: <20180327075332.GA3224@kroah.com>
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On Tue, Mar 27, 2018 at 04:31:49PM +0900, Seung-Woo Kim wrote:
> 
> 
> On 2018년 03월 27일 16:05, Greg KH wrote:
> > On Tue, Mar 27, 2018 at 10:40:33AM +0900, Seung-Woo Kim wrote:
> >> Hello,
> >>
> >> Until 3.18.102, it looks like following patch series for v4l2 seems missed.
> >>
> >> 273caa2 media: v4l2-compat-ioctl32.c: make ctrl_is_pointer work for subdevs
> >> a1dfb4c media: v4l2-compat-ioctl32.c: refactor compat ioctl32 logic
> >> d83a824 media: v4l2-compat-ioctl32.c: don't copy back the result for
> >> certain errors
> >> 169f24c media: v4l2-compat-ioctl32.c: drop pr_info for unknown buffer type
> >> a751be5 media: v4l2-compat-ioctl32.c: copy clip list in put_v4l2_window32
> >> b8c601e media: v4l2-compat-ioctl32.c: fix ctrl_is_pointer
> >> 8ed5a59 media: v4l2-compat-ioctl32.c: copy m.userptr in put_v4l2_plane32
> >> 333b1e9 media: v4l2-compat-ioctl32.c: avoid sizeof(type)
> >> 486c521 media: v4l2-compat-ioctl32.c: move 'helper' functions to
> >> __get/put_v4l2_format32
> >> b7b957d media: v4l2-compat-ioctl32.c: fix the indentation
> >> 3ee6d04 media: v4l2-compat-ioctl32.c: add missing VIDIOC_PREPARE_BUF
> >> 181a4a2 media: v4l2-ioctl.c: don't copy back the result for -ENOTTY
> > 
> > That is correct.
> > 
> >> Any plan to apply the series?
> > 
> > Do you have a backported version of this series that will apply to that
> > kernel tree?  If so, I'll be glad to apply it but I'm pretty sure the
> > reason I did not apply them was because they did not apply correctly.
> 
> I dit not do it myself. I just checked the series is applied on other
> stable trees.

Yes because those trees needed that series.  Also, 3.18.y is barely
alive, if you need to rely on this kernel tree for a device, you are
already maintaining it yourself, right?

> > Also, are you even sure you need these patches for 3.18.y?  Do you have
> > a v4l2 device that relies on these fixes?
> 
> I've just expected A-34624167 is also fixed from other ARM64 devices
> based on 3.18.y.

What is "A-34624167"?

Again, do you have a v4l2 device that uses this interface that needs
these fixes?  In looking at the 3.18.y tree, that's a very small list of
devices that are very old and rare from what I remember.

And if you do have such a device, can you just move to 4.4.y instead?
If you need these patches on 3.18.y, I'll be glad to apply them if you
provide a backported series that you can verify work for you.

thanks,

greg k-h