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

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Date:	Fri, 22 Mar 2013 13:03:13 -0400
From:	Chris Ball <cjb@...top.org>
To:	Sergey Yanovich <ynvich@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Namjae Jeon <linkinjeon@...il.com>,
	linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org
Subject: Re: [PATCH v2] wait while adding MMC host to ensure root mounts

Hi Sergey,

On Wed, Mar 13 2013, Sergey Yanovich wrote:
> MMC hosts are added asynchronously. We need to wait until detect returns to
> avoid failed root filesystem mounts.
> ---8<---
> VFS: Cannot open root device "mmcblk0p1" or unknown-block(0,0): error -6
> Please append a correct "root=" boot option; here are the available partitions:
> mmc0: host does not support reading read-only switch. assuming write-enable.
> 1f00             256 mtdblock0  (driver?)
> 1f01             256 mtdblock1  (driver?)
> 1f02            2560 mtdblock2 mmc0: new SDHC card at address b368
>  (driver?)
> 1f03           29696 mtdblock3  (driver?)
> 1f04           16384 mtdblock4 mmcblk0: mmc0:b368 USD   3.72 GiB
>  (driver?)
>  mmcblk0: p1
> b300         3910656 mmcblk0  driver: mmcblk
>   b301         3906560 mmcblk0p1 00000000-01
> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
> ---8<---
>
> Signed-off-by: Sergey Yanovich <ynvich@...il.com>
> ---
> changes for v2:
> - removed exporting as symbol is in the same file
>
>  drivers/mmc/core/core.c |    1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index aaed768..7196888 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -2225,6 +2225,7 @@ void mmc_start_host(struct mmc_host *host)
>  	host->rescan_disable = 0;
>  	mmc_power_up(host);
>  	mmc_detect_change(host, 0);
> +	mmc_flush_scheduled_work();
>  }
>  
>  void mmc_stop_host(struct mmc_host *host)

Thanks, this looks okay to me, I've pushed it to mmc-next for 3.10.

- Chris.
-- 
Chris Ball   <cjb@...top.org>   <http://printf.net/>
One Laptop Per Child
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