linux-kernel - Re: [PATCH] isdn: hisax: netjet requires VIRT_TO

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Message-ID: <CAMuHMdVhjnX_hag5Y5VvDWVcjPK8tMM-qx-TQ2x=M88yTZQwYg@mail.gmail.com>
Date:	Fri, 15 Mar 2013 07:26:35 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Karsten Keil <isdn@...ux-pingi.de>, netdev@...r.kernel.org
Subject: Re: [PATCH] isdn: hisax: netjet requires VIRT_TO_BUS

On Thu, Mar 14, 2013 at 10:56 PM, Arnd Bergmann <arnd@...db.de> wrote:
> Disabling CONFIG_VIRT_TO_BUS on ARM showed that the hisax netjet
> driver depends on this deprecated functionality but is not
> marked so in Kconfig.
>
> Rather than adding ARM to the already long list of architectures
> that this driver is broken on, this patch adds 'depends on
> VIRT_TO_BUS' and removes the dependency on !SPARC, which is
> also implied by that.

IIRC, the real "arch" dependency for this driver is !BIG_ENDIAN, but
unfortunately
we don't have a generic Kconfig symbol for that.
Perhaps we may want to introduce that?
Of course we prefer to make drivers work on all endianness instead...

> --- a/drivers/isdn/hisax/Kconfig
> +++ b/drivers/isdn/hisax/Kconfig
> @@ -237,7 +237,8 @@ config HISAX_MIC
>
>  config HISAX_NETJET
>         bool "NETjet card"
> -       depends on PCI && (BROKEN || !(SPARC || PPC || PARISC || M68K || (MIPS && !CPU_LITTLE_ENDIAN) || FRV || (XTENSA && !CPU_LITTLE_ENDIAN)))
> +       depends on PCI && (BROKEN || !(PPC || PARISC || M68K || (MIPS && !CPU_LITTLE_ENDIAN) || FRV || (XTENSA && !CPU_LITTLE_ENDIAN)))
> +       depends on VIRT_TO_BUS
>         help
>           This enables HiSax support for the NetJet from Traverse
>           Technologies.
> @@ -248,7 +249,8 @@ config HISAX_NETJET
>
>  config HISAX_NETJET_U
>         bool "NETspider U card"
> -       depends on PCI && (BROKEN || !(SPARC || PPC || PARISC || M68K || (MIPS && !CPU_LITTLE_ENDIAN) || FRV || (XTENSA && !CPU_LITTLE_ENDIAN)))
> +       depends on PCI && (BROKEN || !(PPC || PARISC || M68K || (MIPS && !CPU_LITTLE_ENDIAN) || FRV || (XTENSA && !CPU_LITTLE_ENDIAN)))
> +       depends on VIRT_TO_BUS

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
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