[PATCH v3] serial: 8250: fix error handling in of_platform_serial_probe()

[Alexey Khoroshilov]

clk_disable_unprepare(info->clk) is missed in of_platform_serial_probe(),
while irq_dispose_mapping(port->irq) is missed in of_platform_serial_setup().

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshi...@ispras.ru>
---
v2: Rebase on top of e2860e1f62f2 "serial: 8250_of: Add reset support"
v3: Rename error labels after what they do as Johan Hovold suggested.

 drivers/tty/serial/8250/8250_of.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_of.c 
b/drivers/tty/serial/8250/8250_of.c
index 0cf95fd..6c5a8ca 100644
--- a/drivers/tty/serial/8250/8250_of.c
+++ b/drivers/tty/serial/8250/8250_of.c
@@ -88,7 +88,7 @@ static int of_platform_serial_setup(struct platform_device 
*ofdev,
        ret = of_address_to_resource(np, 0, &resource);
        if (ret) {
                dev_warn(&ofdev->dev, "invalid address\n");
-               goto out;
+               goto err_unprepare;
        }
 
        spin_lock_init(&port->lock);
@@ -130,16 +130,16 @@ static int of_platform_serial_setup(struct 
platform_device *ofdev,
                        dev_warn(&ofdev->dev, "unsupported reg-io-width (%d)\n",
                                 prop);
                        ret = -EINVAL;
-                       goto out;
+                       goto err_dispose;
                }
        }
 
        info->rst = devm_reset_control_get_optional_shared(&ofdev->dev, NULL);
        if (IS_ERR(info->rst))
-               goto out;
+               goto err_dispose;
        ret = reset_control_deassert(info->rst);
        if (ret)
-               goto out;
+               goto err_dispose;
 
        port->type = type;
        port->uartclk = clk;
@@ -167,7 +167,9 @@ static int of_platform_serial_setup(struct platform_device 
*ofdev,
                port->handle_irq = fsl8250_handle_irq;
 
        return 0;
-out:
+err_dispose:
+       irq_dispose_mapping(port->irq);
+err_unprepare:
        if (info->clk)
                clk_disable_unprepare(info->clk);
        return ret;
@@ -201,7 +203,7 @@ static int of_platform_serial_probe(struct platform_device 
*ofdev)
        memset(&port8250, 0, sizeof(port8250));
        ret = of_platform_serial_setup(ofdev, port_type, &port8250.port, info);
        if (ret)
-               goto out;
+               goto err_free;
 
        if (port8250.port.fifosize)
                port8250.capabilities = UART_CAP_FIFO;
@@ -217,15 +219,18 @@ static int of_platform_serial_probe(struct 
platform_device *ofdev)
 
        ret = serial8250_register_8250_port(&port8250);
        if (ret < 0)
-               goto out;
+               goto err_dispose;
 
        info->type = port_type;
        info->line = ret;
        platform_set_drvdata(ofdev, info);
        return 0;
-out:
-       kfree(info);
+err_dispose:
        irq_dispose_mapping(port8250.port.irq);
+       if (info->clk)
+               clk_disable_unprepare(info->clk);
+err_free:
+       kfree(info);
        return ret;
 }
 
-- 
2.7.4