[U-Boot] [PATCH v2] dfu: thor: fix: Modify dfu_get_alt() function to support absolute paths

[Lukasz Majewski <l.majewski@samsung.com>]

Hi Lukasz,

> Recently the ext4 file system imposed passing absolute path with its
> file name parameter.
> As a result dfu_alt_info env variable has been modified to provide
> absolute path when ext4 file system is accessed (e.g. /uImage ext4 0
> 2;).
> 
> Unfortunately, lthor flashing program provides plain file name (like
> uImage) and hence those two file names do not match anymore.
> 
> Presented commit also allows lthor to write files to sub directories
> (like /boot/bin/uImage).
> 
> Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
> Reviewed-by: Marek Vasut <marex@denx.de>
> ---
> Changes for v2:
> - Fix patch to path in comment
> ---
>  drivers/dfu/dfu.c | 29 +++++++++++++++++++++++++++--
>  1 file changed, 27 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/dfu/dfu.c b/drivers/dfu/dfu.c
> index 55e6a83..deafda2 100644
> --- a/drivers/dfu/dfu.c
> +++ b/drivers/dfu/dfu.c
> @@ -544,10 +544,35 @@ struct dfu_entity *dfu_get_entity(int alt)
>  int dfu_get_alt(char *name)
>  {
>  	struct dfu_entity *dfu;
> +	char *str;
>  
>  	list_for_each_entry(dfu, &dfu_list, list) {
> -		if (!strncmp(dfu->name, name, strlen(dfu->name)))
> -			return dfu->alt;
> +		if (dfu->name[0] != '/') {
> +			if (!strncmp(dfu->name, name,
> strlen(dfu->name)))
> +				return dfu->alt;
> +		} else {
> +			/*
> +			 * One must also consider absolute path
> +			 * (/boot/bin/uImage) available at dfu->name
> when
> +			 * compared "plain" file name (uImage)
> +			 *
> +			 * It is the case for e.g. thor gadget where
> lthor SW
> +			 * sends only the file name, so only the
> very last part
> +			 * of path must be checked for equality
> +			 */
> +
> +			str = strstr(dfu->name, name);
> +			if (!str)
> +				continue;
> +
> +			/*
> +			 * Check if matching substring is the last
> element of
> +			 * dfu->name (uImage)
> +			 */
> +			if (strlen(dfu->name) ==
> +			    ((str - dfu->name) + strlen(name)))
> +				return dfu->alt;
> +		}
>  	}
>  
>  	return -ENODEV;

Applied to u-boot-dfu repository. Thanks

-- 
Best regards,

Lukasz Majewski

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