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Subject: Re: [BISECTED REGRESSION] v4.8-rc: DT/OCTEON driver probing broken
To: Aaro Koskinen <aaro.koskinen@nokia.com>,
        Kefeng Wang <wangkefeng.wang@huawei.com>,
        Rob Herring <robh@kernel.org>, devicetree@vger.kernel.org,
        linux-mips@linux-mips.org, Ralf Baechle <ralf@linux-mips.org>,
        David Daney <david.daney@cavium.com>
References: <20160816150056.GD18731@ak-desktop.emea.nsn-net.net>
Cc: linux-kernel@vger.kernel.org
From: Thorsten Leemhuis <regressions@leemhuis.info>
Message-ID: <0336fae0-1717-2f90-c221-6ef69f7024ee@leemhuis.info>
Date: Sun, 28 Aug 2016 12:34:06 +0200
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Lo! Kefeng, below report made it to the list of regression for 4.8, but
afaics nothing happened after the initial report. Is there maybe some
reason why it shouldn't be on the list of regressions at all? Or was the
problem discussed elsewhere? Or is it even fixed already? I noticed
https://git.kernel.org/torvalds/c/fc520f8b4f (of/platform: disable the
of_platform_default_populate_init() for all the ppc board), but that
change is PPC specific.

Ciao, Thorsten

On 16.08.2016 17:00, Aaro Koskinen wrote:
> Hi,
> 
> Commit 44a7185c2ae6 ("of/platform: Add common method to populate default
> bus") added new arch_initcall of_platform_default_populate_init() that
> will be called before device_initcall octeon_publish_devices(). Now the
> of_platform_bus_probe() called in octeon_publish_devices() is apparently
> doing nothing:
> 
> [   52.331353] calling  octeon_publish_devices+0x0/0x14 @ 1
> [   52.331358] OF: of_platform_bus_probe()
> [   52.331362] OF:  starting at: /
> [   52.331378] OF: of_platform_bus_create() - skipping /soc@0, already populated
> [   52.331394] initcall octeon_publish_devices+0x0/0x14 returned 0 after 29 usecs
> 
> This also means that USB etc. won't get probed.
> 
> Any ideas what would be the proper fix for this? Changing
> octeon_publish_devices() to arch_initcall seems to work but that may be
> a bit hackish... Also, there might be also other MIPS boards affected
> (arch/mips/netlogic/xlp/dt.c, arch/mips/mti-malta/malta-dt.c).
> 
> A.
> 
> http://news.gmane.org/find-root.php?message_id=20160816150056.GD18731%40ak-desktop.emea.nsn-net.net 
> http://mid.gmane.org/20160816150056.GD18731%40ak-desktop.emea.nsn-net.net
>