[U-Boot] [PATCH] cmd: usb: check if_type before using this device

[Marek Vasut <marex@denx.de>]

On 06/17/2016 08:18 AM, Peng Fan wrote:
> For legacy usb storage driver, USB_MAX_STOR_DEV is defined as 7.
> If we only have one usb disk on board, `usb dev 0` is ok.
> But if `usb dev 1`, still ok, then `usb read xxx` will trigger
> system fault and reboot.
> 
> So check if_type before using this device.

Applied, thanks

> Signed-off-by: Peng Fan <peng.fan@nxp.com>
> Cc: Simon Glass <sjg@chromium.org>
> Cc: Hans de Goede <hdegoede@redhat.com>
> Cc: Bin Meng <bmeng.cn@gmail.com>
> Cc: Marek Vasut <marex@denx.de>
> Cc: Stefan Roese <sr@denx.de>
> Cc: Marcel Ziswiler <marcel.ziswiler@toradex.com>
> Cc: Peng Fan <peng.fan@nxp.com>
> Cc: Stephen Warren <swarren@nvidia.com>
> ---
>  cmd/usb.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/cmd/usb.c b/cmd/usb.c
> index b83d323..58d9db2 100644
> --- a/cmd/usb.c
> +++ b/cmd/usb.c
> @@ -800,7 +800,8 @@ static int do_usb(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
>  			int dev = (int)simple_strtoul(argv[2], NULL, 10);
>  			printf("\nUSB device %d: ", dev);
>  			stor_dev = blk_get_devnum_by_type(IF_TYPE_USB, dev);
> -			if (stor_dev == NULL) {
> +			if ((stor_dev == NULL) ||
> +			    (stor_dev->if_type == IF_TYPE_UNKNOWN)) {
>  				printf("unknown device\n");
>  				return 1;
>  			}
> 


-- 
Best regards,
Marek Vasut