linux-kernel - Re: [PATCH] driver core: add wait event for deferred probe

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Date:	Thu, 14 Feb 2013 11:08:41 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	"Russell King - ARM Linux" <linux@....linux.org.uk>
Cc:	anish singh <anish198519851985@...il.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Haojian Zhuang <haojian.zhuang@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	viro@...iv.linux.org.uk, rusty@...tcorp.com.au,
	hpa@...ux.intel.com, jim.cromie@...il.com,
	linux-kernel@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>,
	broonie@...nsource.wolfsonmicro.com,
	Patch Tracking <patches@...aro.org>
Subject: Re: [PATCH] driver core: add wait event for deferred probe

On Thursday 14 February 2013, Russell King - ARM Linux wrote:
> In the general case, that remains true, but it's still not true for
> console drivers.
> 
> The console should be initialised before it is attempted to be opened
> before passing control to userspace, which happens before the .init
> section is freed.

Yes, I forgot about that. This is indeed an additional requirement
besides what I listed. The late_initcall in which Grant was adding
the serialization however is executed just before the /dev/console
gets opened, which seems like an appropriate place.

What might get into the way is that other late_initcalls get
executed after this one and are required for the console. In
that case, we would have to move the deferred_probe_initcall
from a late_initcall to the end of do_basic_setup, after all
the other initcalls.

	Arnd
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