linux-kernel - Re: cirrusdrmfb broken with simplefb

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Message-ID: <CAMuHMdXk6EVdKGH5qq2qeT4b_ZvVxoqsYhBUv+cL2uAeFbpzRw@mail.gmail.com>
Date:	Wed, 18 Dec 2013 09:48:21 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	David Herrmann <dh.herrmann@...il.com>,
	Stephen Warren <swarren@...dotorg.org>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: cirrusdrmfb broken with simplefb

On Wed, Dec 18, 2013 at 9:44 AM, Takashi Iwai <tiwai@...e.de> wrote:
>> That bug always existed, simplefb is just the first driver to hit it
>> (vesafb/efifb didn't use resources).
>
> Heh, the bug didn't "exist" because no other grabbed the resource
> before.  The way the cirrus driver allocates the resource is no bug,
> per se.  But the proper resource takeover is missing.
>
>> I'm aware of the issue but as a
>> workaround you can simply disable CONFIG_X86_SYSFB. That restores the
>> old behavior.
>
> Yes, but CONFIG_X86_SYSFB breaks things as of now.  Shouldn't it be
> mentioned or give some kconfig hints instead of silently giving a
> broken output, if any quick fix isn't possible?

Indeed. That's called a "regression" in distro/allmodconfig kernels.

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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