powerpc/mpc5200: fix error paths in PSC UART probe function

- error cases for mapbase and irq were unbundled
- mapped irq now gets disposed on error

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

diff --git a/drivers/serial/mpc52xx_uart.c b/drivers/serial/mpc52xx_uart.c
index d2a1fc2..0c3a2ab 100644 (file)
--- a/drivers/serial/mpc52xx_uart.c
+++ b/drivers/serial/mpc52xx_uart.c
@@ -1148,22 +1148,29 @@ mpc52xx_uart_of_probe(struct of_device *op, const struct of_device_id *match)
                return ret;
 
        port->mapbase = res.start;
+       if (!port->mapbase) {
+               dev_dbg(&op->dev, "Could not allocate resources for PSC\n");
+               return -EINVAL;
+       }
+
        port->irq = irq_of_parse_and_map(op->node, 0);
+       if (port->irq == NO_IRQ) {
+               dev_dbg(&op->dev, "Could not get irq\n");
+               return -EINVAL;
+       }
 
        dev_dbg(&op->dev, "mpc52xx-psc uart at %p, irq=%x, freq=%i\n",
                (void *)port->mapbase, port->irq, port->uartclk);
 
-       if ((port->irq == NO_IRQ) || !port->mapbase) {
-               printk(KERN_ERR "Could not allocate resources for PSC\n");
-               return -EINVAL;
-       }
-
        /* Add the port to the uart sub-system */
        ret = uart_add_one_port(&mpc52xx_uart_driver, port);
-       if (!ret)
-               dev_set_drvdata(&op->dev, (void *)port);
+       if (ret) {
+               irq_dispose_mapping(port->irq);
+               return ret;
+       }
 
-       return ret;
+       dev_set_drvdata(&op->dev, (void *)port);
+       return 0;
 }
 
 static int