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

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Date:	Thu, 14 Mar 2013 15:57:56 +0400
From:	Sergey Yanovich <ynvich@...il.com>
To:	Namjae Jeon <linkinjeon@...il.com>
CC:	Chris Ball <cjb@...top.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org
Subject: Re: [PATCH v2] wait while adding MMC host to ensure root mounts

On 14/03/13 08:08, Namjae Jeon wrote:> 2013/3/14, Sergey Yanovich <ynvich@...il.com>:
>> Kernel panic - not syncing: VFS: Unable to mount root fs on
>> unknown-block(0,0)

> Have you ever tried to use rootwait or rootdelay on command line ?
> If no, You can use them.

Those options work. However, they introduce a delay in the range of hundreds milliseconds and seconds respectively. They delay is not required. If a cards is present, mmc_rescan will return synchronously with card initialized.

prepare_namespace() uses wait_for_device_probe(). The latter assumes that all "known devices" have initialized by the time it returns. MMC is not currently delivering on the assumptions. It will with the patch applied.
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