[U-Boot] [PATCH 3/4 v2] cmd: mtd: Don't use with negative return codes for shell commands

[Boris Brezillon <boris.brezillon@bootlin.com>]

On Tue,  7 Aug 2018 14:16:54 +0200
Stefan Roese <sr@denx.de> wrote:

> When negative return codes are used in commands (do_foo()), the shell
> prints these messages:
> 
> exit not allowed from main input shell.
> 
> Change the return codes in the new mtd commands to use only positive
> values and these annoying warnings are gone.
> 
> Signed-off-by: Stefan Roese <sr@denx.de>
> Cc: Miquel Raynal <miquel.raynal@bootlin.com>
> Cc: Boris Brezillon <boris.brezillon@bootlin.com>
> Cc: Jagan Teki <jagan@openedev.com>

Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>

> ---
> v2:
> - Use CMD_RET_FAILURE as return value as suggested by Boris
> 
>  cmd/mtd.c | 18 ++++++++++--------
>  1 file changed, 10 insertions(+), 8 deletions(-)
> 
> diff --git a/cmd/mtd.c b/cmd/mtd.c
> index 999d686e66..b29aec18ca 100644
> --- a/cmd/mtd.c
> +++ b/cmd/mtd.c
> @@ -188,7 +188,7 @@ static int do_mtd_list(void)
>  
>  	if (!dev_nb) {
>  		printf("No MTD device found\n");
> -		return -EINVAL;
> +		return CMD_RET_FAILURE;
>  	}
>  
>  	return 0;
> @@ -269,13 +269,13 @@ static int do_mtd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
>  		if (mtd_is_aligned_with_min_io_size(mtd, off)) {
>  			printf("Offset not aligned with a page (0x%x)\n",
>  			       mtd->writesize);
> -			return -EINVAL;
> +			return CMD_RET_FAILURE;
>  		}
>  
>  		if (mtd_is_aligned_with_min_io_size(mtd, len)) {
>  			printf("Size not a multiple of a page (0x%x)\n",
>  			       mtd->writesize);
> -			return -EINVAL;
> +			return CMD_RET_FAILURE;
>  		}
>  
>  		if (dump)
> @@ -285,7 +285,7 @@ static int do_mtd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
>  
>  		if (!buf) {
>  			printf("Could not map/allocate the user buffer\n");
> -			return -ENOMEM;
> +			return CMD_RET_FAILURE;
>  		}
>  
>  		printf("%s %lldB (%d page(s)) at offset 0x%08llx%s%s\n",
> @@ -306,7 +306,7 @@ static int do_mtd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
>  		if (ret) {
>  			printf("%s on %s failed with error %d\n",
>  			       read ? "Read" : "Write", mtd->name, ret);
> -			return ret;
> +			return CMD_RET_FAILURE;
>  		}
>  
>  		if (dump) {
> @@ -346,13 +346,13 @@ static int do_mtd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
>  		if (mtd_is_aligned_with_block_size(mtd, off)) {
>  			printf("Offset not aligned with a block (0x%x)\n",
>  			       mtd->erasesize);
> -			return -EINVAL;
> +			return CMD_RET_FAILURE;
>  		}
>  
>  		if (mtd_is_aligned_with_block_size(mtd, len)) {
>  			printf("Size not a multiple of a block (0x%x)\n",
>  			       mtd->erasesize);
> -			return -EINVAL;
> +			return CMD_RET_FAILURE;
>  		}
>  
>  		erase_op.mtd = mtd;
> @@ -366,7 +366,9 @@ static int do_mtd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
>  		return CMD_RET_USAGE;
>  	}
>  
> -	return ret;
> +	if (ret)
> +		return CMD_RET_FAILURE;
> +	return 0;
>  }
>  
>  static char mtd_help_text[] =