serial: arc_uart: fix of_iomap leak in `arc_serial_probe`

Smatch reports:

drivers/tty/serial/arc_uart.c:631 arc_serial_probe() warn:
'port->membase' from of_iomap() not released on lines: 631.

In arc_serial_probe(), if uart_add_one_port() fails,
port->membase is not released, which would cause a resource leak.

To fix this, I replace of_iomap with devm_platform_ioremap_resource.

Fixes: 8dbe1d5e09a7 ("serial/arc: inline the probe helper")
Signed-off-by: Ke Zhang <m202171830@hust.edu.cn>
Reviewed-by: Dongliang Mu <dzm91@hust.edu.cn>
Link: https://lore.kernel.org/r/20230428031636.44642-1-m202171830@hust.edu.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/arc_uart.c b/drivers/tty/serial/arc_uart.c
index 59e25f2b6632215cbb06a60a4c17e57402abc53e..4b2512eef577b431748cf539609cb4e72678633c 100644 (file)
--- a/drivers/tty/serial/arc_uart.c
+++ b/drivers/tty/serial/arc_uart.c
@@ -606,10 +606,11 @@ static int arc_serial_probe(struct platform_device *pdev)
        }
        uart->baud = val;
 
-       port->membase = of_iomap(np, 0);
-       if (!port->membase)
+       port->membase = devm_platform_ioremap_resource(pdev, 0);
+       if (IS_ERR(port->membase)) {
                /* No point of dev_err since UART itself is hosed here */
-               return -ENXIO;
+               return PTR_ERR(port->membase);
+       }
 
        port->irq = irq_of_parse_and_map(np, 0);