linux-kernel - Re: [PATCH v2] nubus: Call bus

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Date:   Wed, 9 May 2018 09:31:36 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Finn Thain <fthain@...egraphics.com.au>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] nubus: Call bus_register unconditionally

On Wed, May 9, 2018 at 3:04 AM, Finn Thain <fthain@...egraphics.com.au> wrote:
> Loading a NuBus driver module on a non-NuBus machine triggers the
> BUG_ON(!drv->bus->p) in driver_register(), because bus_register() was
> not called, because it is conditional on MACH_IS_MAC.
>
> Fix the crash by calling bus_register() unconditionally. Call it from
> a postcore_initcall(), like other busses do.
>
> Hence, the bus type is available for device_register(), which happens
> in a subsys initcall, and for driver_register(), which happens in a
> device or module initcall.
>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Reported-by: Michael Schmitz <schmitzmic@...il.com>
> Tested-by: Stan Johnson <userm57@...oo.com>
> Fixes: 7f86c765a6a2 ("nubus: Add support for the driver model")
> Signed-off-by: Finn Thain <fthain@...egraphics.com.au>

Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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