linux-kernel - Re: [PATCH v2] wait while adding MMC host to ensure root mounts

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Date:	Sat, 13 Apr 2013 16:52:28 +0400
From:	Sergey Yanovich <ynvich@...il.com>
To:	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Namjae Jeon <linkinjeon@...il.com>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Chris Ball <cjb@...top.org>, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] wait while adding MMC host to ensure root mounts

On Sat, 2013-04-13 at 13:56 +0200, Ulf Hansson wrote:
> 
> Den 13 apr 2013 12:49 skrev "Sergey Yanovich" <ynvich@...il.com>:
> > A possible solution is to make card a separate device (now only the
> host
> > is a device). In this case, the probing could be done asynchronously
> > without breaking the assumption in prepare_namespace().
> 
> Actually the card is already a separate device, which I connected to
> the mmc bus.

Great. I failed to see that.

> It is an interesting idea, but the problem is that the card device is
> only created and added on the fly when a card has been properly
> detected.

If we include 'detecting' in 'probing' and then do 'probing'
asynchronously, we will neither have race condition, nor boot time
regression.

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