serial: sh-sci: Fix probe error paths

When probing fails, the driver must not try to cleanup resources that
have not been initialized. Fix this.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 4604153..27df2ad 100644 (file)
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -2179,6 +2179,16 @@ static int __devinit sci_init_single(struct platform_device *dev,
        return 0;
 }
 
+static void sci_cleanup_single(struct sci_port *port)
+{
+       sci_free_gpios(port);
+
+       clk_put(port->iclk);
+       clk_put(port->fclk);
+
+       pm_runtime_disable(port->port.dev);
+}
+
 #ifdef CONFIG_SERIAL_SH_SCI_CONSOLE
 static void serial_console_putchar(struct uart_port *port, int ch)
 {
@@ -2360,14 +2370,10 @@ static int sci_remove(struct platform_device *dev)
        cpufreq_unregister_notifier(&port->freq_transition,
                                    CPUFREQ_TRANSITION_NOTIFIER);
 
-       sci_free_gpios(port);
-
        uart_remove_one_port(&sci_uart_driver, &port->port);
 
-       clk_put(port->iclk);
-       clk_put(port->fclk);
+       sci_cleanup_single(port);
 
-       pm_runtime_disable(&dev->dev);
        return 0;
 }
 
@@ -2392,7 +2398,13 @@ static int __devinit sci_probe_single(struct platform_device *dev,
        if (ret)
                return ret;
 
-       return uart_add_one_port(&sci_uart_driver, &sciport->port);
+       ret = uart_add_one_port(&sci_uart_driver, &sciport->port);
+       if (ret) {
+               sci_cleanup_single(sciport);
+               return ret;
+       }
+
+       return 0;
 }
 
 static int __devinit sci_probe(struct platform_device *dev)
@@ -2413,24 +2425,22 @@ static int __devinit sci_probe(struct platform_device *dev)
 
        ret = sci_probe_single(dev, dev->id, p, sp);
        if (ret)
-               goto err_unreg;
+               return ret;
 
        sp->freq_transition.notifier_call = sci_notifier;
 
        ret = cpufreq_register_notifier(&sp->freq_transition,
                                        CPUFREQ_TRANSITION_NOTIFIER);
-       if (unlikely(ret < 0))
-               goto err_unreg;
+       if (unlikely(ret < 0)) {
+               sci_cleanup_single(sp);
+               return ret;
+       }
 
 #ifdef CONFIG_SH_STANDARD_BIOS
        sh_bios_gdb_detach();
 #endif
 
        return 0;
-
-err_unreg:
-       sci_remove(dev);
-       return ret;
 }
 
 static int sci_suspend(struct device *dev)