linux-kernel - Re: Runaway loop with the current git.

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Date:	Sun, 7 Dec 2008 19:13:13 +0100
From:	"Kay Sievers" <kay.sievers@...y.org>
To:	"Alan Cox" <alan@...rguk.ukuu.org.uk>
Cc:	"Evgeniy Polyakov" <zbr@...emap.net>,
	"Herbert Xu" <herbert@...dor.apana.org.au>,
	linux-kernel@...r.kernel.org,
	"Linux Crypto Mailing List" <linux-crypto@...r.kernel.org>
Subject: Re: Runaway loop with the current git.

On Sun, Dec 7, 2008 at 19:03, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> On Sun, 7 Dec 2008 20:54:38 +0300
> Evgeniy Polyakov <zbr@...emap.net> wrote:
>
>> On Sun, Dec 07, 2008 at 05:52:45PM +0000, Alan Cox (alan@...rguk.ukuu.org.uk) wrote:
>> > > Alan, let's make some progress on this fingerpointing. If Herbert's
>> > > patch fixes the crypto loading problem, it will find its way upstream
>> > > for the current tree, and in the merge window Kay's patch may be applied
>> > > and widely tested. Thoughts?
>> >
>> > I have no intention of applying Kay's patch because it is wrong and it
>> > will only break things not fix them.
>>
>> And you are sure it breaks something based on what?
>
>
> Firstly:
>
> You propose to implement
>
>                modprobe fails (due to crypto requirements)
>                open /dev/console
>                        -ENODEV
>                log error to nowhere

Yes, log nowhere instead of running in a loop would be much better
than loading a 5:1 driver which will never exist as a module.

> Why is this useful - you now get failing module loads producing no
> diagnostics and in many case the setup just dying silently.

It's obviously more useful than not to boot up.

> Previously
> you got an attempt to recover and diagnostics which allowed the problem
> to be found (as Herbert did)
>
> Secondly:
>
> If I have a /dev/console on a PCI device and I have modprobe set to load
> 8250_pci or a framebuffer driver when the console is opened you will
> break the current working behaviour.

No, the pci driver will never get loaded by modprobe 5:1, that's all
what this bug is about. It connects to the existing console device
when the driver is loaded, and at that moment /dev/console gets
working.

Kay
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