linux-kernel - Re: Wait for console to become available, v3.2

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Message-ID: <20090421063549.3b71881d@infradead.org>
Date:	Tue, 21 Apr 2009 06:35:49 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	David VomLehn <dvomlehn@...co.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux USB Mailing List <linux-usb@...r.kernel.org>,
	Linux Embedded Mailing List <linux-embedded@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Wait for console to become available, v3.2

On Tue, 21 Apr 2009 08:43:46 +0200
Ingo Molnar <mingo@...e.hu> wrote:

> The proper approach would be to use one of the async_synchronize*() 
> facilities in kernel/async.c to properly order the opening of the 
> console with device init.

Unfortunately this is not the answer.

First of all, USB does not use the async_* infrastructure, so it does
not do anything.
But more importantly... USB *CANNOT* do this fundamental operation.
USB does not have the capability to know when you have seen all devices
that are connected. Devices just show up a random amount of time after
you turn the power on for the bus.... there's no "and now we've seen
all" operation.

-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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