[U-Boot] [PATCH V2] cmd_mmc.c: check mmc_init() during mmc dev

[Jaehoon Chung <jh80.chung@samsung.com>]

Hi, Stephen.

i didn't apply your patch. Which repository do you use?
Well, if you want to check, can be used "if (mmc_init(mmc))".

And i'm not sure whether this code is really need or not.

Best Regards,
Jaehoon Chung

On 05/21/2014 01:57 AM, Stephen Warren wrote:
> From: Bryan Wu <cooloney@gmail.com>
> 
> mmc dev ${devnum} will return 0 as success even if there is no card
> inserted. Booting script like tegra-common-post.h will call mmc dev
> ${devnum} to check the mmc device status, it always return 0 even if
> mmc_init() fails.
> 
> Check mmc_init() return value let mmc dev command return failure
> when mmc_init() fails.
> 
> Signed-off-by: Bryan Wu <pengw@nvidia.com>
> [swarren: Always return 1 on error; hush doesn't appear to support
> arbitrary return values. Fixed compilation error due to multiple
> declaration of ret variable.]
> Tested-by: Stephen Warren <swarren@nvidia.com>
> Signed-off-by: Stephen Warren <swarren@nvidia.com>
> ---
> v2:
> * Always return 1 on error; hush doesn't appear to support
>   arbitrary return values.
> * Fixed compilation error due to multiple declaration of ret variable.
> ---
>  common/cmd_mmc.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/common/cmd_mmc.c b/common/cmd_mmc.c
> index 572aa895fa1c..2e564572f74d 100644
> --- a/common/cmd_mmc.c
> +++ b/common/cmd_mmc.c
> @@ -217,7 +217,10 @@ static int do_mmcops(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
>  			return 1;
>  		}
>  
> -		mmc_init(mmc);
> +		ret = mmc_init(mmc);
> +		if (ret)
> +			return 1;
> +
>  		if (part != -1) {
>  			ret = mmc_select_hwpart(dev, part);
>  			printf("switch to partitions #%d, %s\n",
>