linux-kernel - Re: [GIT PULL] On-demand device probing

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Message-ID: <CAL_Jsq+34sRXe0HWCKNceQfLj=WfDV4-soynumvdnH_nwuj+9g@mail.gmail.com>
Date:	Sat, 17 Oct 2015 10:19:27 -0500
From:	Rob Herring <robh+dt@...nel.org>
To:	Olof Johansson <olof@...om.net>
Cc:	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	Russell King <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Michael Turquette <mturquette@...libre.com>,
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Subject: Re: [GIT PULL] On-demand device probing

On Fri, Oct 16, 2015 at 4:23 PM, Olof Johansson <olof@...om.net> wrote:
> Hi,
>
> I've bisected boot failures in next-20151016 down to patches in this branch:
>
> On Thu, Oct 15, 2015 at 4:42 AM, Tomeu Vizoso
> <tomeu.vizoso@...labora.com> wrote:
>> Tomeu Vizoso (20):
>>       driver core: handle -EPROBE_DEFER from bus_type.match()
>
> The machine it happened on was OMAP5UEVM:
>
> http://arm-soc.lixom.net/bootlogs/next/next-20151016/omap5uevm-arm-omap2plus_defconfig.html

So this one is because the MMC node numbering changed. I don't know
how to fix that other than with aliases, but that doesn't solve
backwards compatibility.


> But I've also seen it on tegra2, that one bisected down to:
>
>>      regulator: core: Probe regulators on demand
>
> http://arm-soc.lixom.net/bootlogs/next/next-20151016/seaboard-arm-multi_v7_defconfig.html

This one you need a rootwait I think. The MMC scanning is not
guaranteed to be done before the rootfs mounting AFAIK. There may be
other problems, but we can't see them since it panics.

Rob
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