Re: Runaway loop with the current git.

From: Alan Cox
Date: Sun Dec 07 2008 - 12:29:03 EST

> > /dev/console is a logical mapping to a device which may well be
> > different, loaded after PCI is initialised and dependant on PCI.
> So wrong. If no driver is associated, like early, in that case, we
> must return -ENODEV, instead of calling modprobe in a loop. It's a
> built-in device, and it's easy to fix.

You've clearly no idea how initrd even works have you ? If it just
returned -ENODEV you wouldn't be able to open the console and you
wouldn't trigger the loading of the module to get the console running. So
you've now completely buggered the boot process.

The correct sequence is

Open device
Kernel issues hotplug message
Hotplug script loads drivers to policy

The problem case you have due to initrd bugs is

Open device
Kernel issues hotplug message
Hotplug script opens same device (BUG)
Kernel issues hotplug message
Kernel detects this is stuck
Kernel replies with -ENODEV/-ENXIO to try
and rescue itself from buggy initrd scripts

That is how it has worked since we first had script based module
requesting which is some years now.

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