Possible Regression due to c074fef5d36e ("of/platform: Defer probes of registered devices").

[Geert Uytterhoeven]

Hi Russell,

On Mon, Oct 26, 2015 at 11:41 AM, Russell King - ARM Linux
<linux at arm.linux.org.uk> wrote:
> On Mon, Oct 26, 2015 at 10:56:03AM +0100, Geert Uytterhoeven wrote:
>> On Mon, Oct 26, 2015 at 10:40 AM, Sylvain Rochet
>> <sylvain.rochet at finsecur.com> wrote:
>> > On Mon, Oct 26, 2015 at 12:20:39PM +0900, Simon Horman wrote:
>> >> I have observed a possible regression in next-20151022
>> >> due to c074fef5d36e ("of/platform: Defer probes of registered devices").
>> >>
>> >> The problem manifests on the r8a7791 based koelsch board.
>> >> With the above patch present booting the board using the shmobile_defconfig
>> >> results in no console output. While after reverting the above patch
>> >> the boot proceeds all the way to user-space.
>> >>
>> >> With DEBUG_LL and EARLY_PRINTK enabled I was able to capture some console
>> >> output. I have included both that boot log, and a log of boot all the way to
>> >> userspace with the patch in question reverted.
>> >>
>> >> The problem does not seem to manifiest on other boards for other
>> >> Renesas ARM  SoCs that I have access too. In particular the
>> >> r8a7790 based lager board; the r8a7790 and r8a7791 are both members
>> >> of the R-Car Gen2 family of SoCs.
>> >
>> > Atmel SoC hit this regresssion too, discussion about this issue is in
>> > the following thread:
>> >  https://lkml.org/lkml/2015/10/16/733
>>
>> More reading material in "[GIT PULL] On-demand device probing"
>> (https://lkml.org/lkml/2015/10/14/126)
>
> It's quite obvious from the thread that the on-demand device probing is
> *not* going to be merged for 4.4, and so it should not be in linux-next
> at all.  Having it in linux-next, it's disrupting people's testing of
> the 4.4 merge window material.
>
> Tomeu, please remove it so people can continue to test material
> sheduled for the 4.4 merge window.  Thanks.

Unfortunately we'll be stuck with next-20151022 for a while, due to KS...

So you're only option is manually reverting
commit 138d8b73e6a32aeacd3417106fbf740865da309e
Merge: 0f1cba62520b6119 c074fef5d36e1c27
Author: Rob Herring <robh at kernel.org>
Date:   Thu Oct 15 08:26:41 2015 -0500

    Merge branch 'on-demand-probes-for-next' of git://git.collabora.com/git/user

    Pull on-demand probing series from Tomeu Vizoso.

"git revert 138d8b73e6a32aeacd3417106fbf740865da309e -m 2" and fix
the (many) conflicts :-(

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds