RSI_USB_CTRL_BUF_SIZE
if (len > RSI_USB_CTRL_BUF_SIZE)
buf = kmalloc(RSI_USB_CTRL_BUF_SIZE, GFP_KERNEL);
if (len > RSI_USB_CTRL_BUF_SIZE)
usb_reg_buf = kmalloc(RSI_USB_CTRL_BUF_SIZE, GFP_KERNEL);