linux-kernel - Re: [PATCH 1/4] base: soc: Early register bus when needed

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Date:   Mon, 10 Oct 2016 16:15:05 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Simon Horman <horms@...ge.net.au>,
        Magnus Damm <magnus.damm@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Yangbo Lu <yangbo.lu@....com>,
        Lee Jones <lee.jones@...aro.org>,
        Dirk Behme <dirk.behme@...bosch.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] base: soc: Early register bus when needed

On Tuesday, October 4, 2016 11:09:24 AM CEST Geert Uytterhoeven wrote:
> If soc_device_register() is called before soc_bus_register(), it crashes
> with a NULL pointer dereference.
> 
> soc_bus_register() is already a core_initcall(), but drivers/base/ is
> entered later than e.g. drivers/pinctrl/ and drivers/soc/. Hence there
> are several subsystems that may need to know SoC revision information,
> while it's not so easy to initialize the SoC bus even earlier using an
> initcall.
> 
> To fix this, let soc_device_register() register the bus early if that
> hasn't happened yet.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> 

Not nice, but I can't think of a better alternative, so

Acked-by: Arnd Bergmann <arnd@...db.de>