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

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Message-ID: <20081207165740.2c4bbb0d@lxorguk.ukuu.org.uk>
Date:	Sun, 7 Dec 2008 16:57:40 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Kay Sievers" <kay.sievers@...y.org>
Cc:	"Herbert Xu" <herbert@...dor.apana.org.au>, zbr@...emap.net,
	linux-kernel@...r.kernel.org,
	"Linux Crypto Mailing List" <linux-crypto@...r.kernel.org>
Subject: Re: Runaway loop with the current git.

> > It isn't a problem. It is trying to have hotplug load a suitable driver.
> > This is what is supposed to happen.
> 
> No, it's not. 5:1 is _in_ the kernel, and must not be tried to be
> loaded by the kernel. We need to make /dev/console access return
> -ENODEV if not available, not try to load a module for it.

Hello earth calling, wake up.

The userspace opens major 5 minor 1. The kernel has no driver mapped to
that so the kernel asks user space to load a module of its choice for
major 5 minor 1. What user space does with that is and has always been a
problem for user space.

User space is quite at liberty to go .. 5,1  and I have a serial console
I want to load 8250_pci please.

What it must not do is try and re-open it again and again and again.

You may not assume that a given device load mapping is solely used to
create the most basic device node involved. It isn't that simple. In many
cases a device node translates to a series of module loads of otherwise
apparently unrelated devices.

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