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From: Arnd Bergmann <arnd@arndb.de>
To: "Russell King - ARM Linux" <linux@arm.linux.org.uk>
Subject: Re: [PATCH] driver core: add wait event for deferred probe
Date: Thu, 14 Feb 2013 11:08:41 +0000
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Cc: anish singh <anish198519851985@gmail.com>,
        Grant Likely <grant.likely@secretlab.ca>,
        Haojian Zhuang <haojian.zhuang@linaro.org>,
        Andrew Morton <akpm@linux-foundation.org>,
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        Linus Walleij <linus.walleij@linaro.org>,
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        Patch Tracking <patches@linaro.org>
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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