On Fri, Jun 11, 2021 at 4:32 AM Yang Yingliang <yangyingliang@xxxxxxxxxx> wrote: > rx_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rxfifo"); > tx_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "txfifo"); > + if (!rx_res || !tx_res) { > + dev_err(dev, "Invalid resource\n"); > + return -EINVAL; > + } If platform_get_resource_byname() returns an error, it's probably because the name cannot be found. So I think this error message is more accurate: "could not find rxfifo or txfifo resource"