[U-Boot] [PATCH] cmd/usb_mass_storage.c: Rework ums_init() ret logic slightly

[Marek Vasut <marex@denx.de>]

On 04/20/2016 05:01 PM, Tom Rini wrote:
> Previously, ret could be used uninitialized if
> blk_get_device_part_str() failed.  Default to ret being set to -1 so
> that we always return an err up if we have a problem and then invert the
> logic on testing ums_count as when that is non-zero is the time we can
> return 0.
> 
> Cc: John Tobias <john.tobias.ph@gmail.com>
> Cc: Marek Vasut <marex@denx.de>
> Signed-off-by: Tom Rini <trini@konsulko.com>
> ---
>  cmd/usb_mass_storage.c | 9 ++-------
>  1 file changed, 2 insertions(+), 7 deletions(-)
> 
> diff --git a/cmd/usb_mass_storage.c b/cmd/usb_mass_storage.c
> index ac53a73..b03d567 100644
> --- a/cmd/usb_mass_storage.c
> +++ b/cmd/usb_mass_storage.c
> @@ -56,7 +56,7 @@ static int ums_init(const char *devtype, const char *devnums_part_str)
>  	struct blk_desc *block_dev;
>  	disk_partition_t info;
>  	int partnum;
> -	int ret;
> +	int ret = -1;
>  	struct ums *ums_new;
>  
>  	s = strdup(devnums_part_str);
> @@ -86,13 +86,11 @@ static int ums_init(const char *devtype, const char *devnums_part_str)
>  
>  		/* f_mass_storage.c assumes SECTOR_SIZE sectors */
>  		if (block_dev->blksz != SECTOR_SIZE) {

You can also drop the {} braces now.

Otherwise,

Acked-by: Marek Vasut <marex@denx.de>

> -			ret = -1;
>  			goto cleanup;
>  		}
>  
>  		ums_new = realloc(ums, (ums_count + 1) * sizeof(*ums));
>  		if (!ums_new) {
> -			ret = -1;
>  			goto cleanup;
>  		}
>  		ums = ums_new;
> @@ -111,7 +109,6 @@ static int ums_init(const char *devtype, const char *devnums_part_str)
>  
>  		name = malloc(UMS_NAME_LEN);
>  		if (!name) {
> -			ret = -1;
>  			goto cleanup;
>  		}
>  		snprintf(name, UMS_NAME_LEN, "UMS disk %d", ums_count);
> @@ -127,9 +124,7 @@ static int ums_init(const char *devtype, const char *devnums_part_str)
>  		ums_count++;
>  	}
>  
> -	if (!ums_count)
> -		ret = -1;
> -	else
> +	if (ums_count)
>  		ret = 0;
>  
>  cleanup:
> 


-- 
Best regards,
Marek Vasut