Re: PATCH: clean up the IDE iops, add ones for a dead iface

[Alan Cox]

On Wed, 2003-02-19 at 09:39, Benjamin Herrenschmidt wrote:
> Hrm... I tend to agree with Russell here... 0x7f is the "safe" value
> for IDE. IDE controllers with nothing wired shall have a pull down
> on D7. The reason is simple: busy loops in the IDE code waiting for
> BSY to go down.
> 
> Now, if your point is to keep BSY up and have wait loops timeout,
> then 0xff may actually make some sense ;)

0xFF is what happens with a real hot unplug so we must handle it
irrespective of convenience. Your probe loop might want to check
some kind of 'dead' variable when this is all done I guess. That
way we can have

	unplugged_event()
	{
		change iops
		drive->dead = 1;
	}

and the probe code can spot ->dead in the poll loop