serial: mxs-auart: disable clks of Alphascale ASM9260

In case of Alphascale ASM9260 probe() enables s->clk and s->clk_ahb
via mxs_get_clks(), but there is no disable of the clocks.
The patch adds it to error paths and to mxs_auart_remove().

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

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Fixes: 254da0d753fb ("serial: mxs-auart: add Alphascale ASM9260 support")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
index caa8a41..76aa289 100644 (file)
--- a/drivers/tty/serial/mxs-auart.c
+++ b/drivers/tty/serial/mxs-auart.c
@@ -1678,8 +1678,10 @@ static int mxs_auart_probe(struct platform_device *pdev)
                return ret;
 
        r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-       if (!r)
-               return -ENXIO;
+       if (!r) {
+               ret = -ENXIO;
+               goto out_disable_clks;
+       }
 
        s->port.mapbase = r->start;
        s->port.membase = ioremap(r->start, resource_size(r));
@@ -1694,21 +1696,23 @@ static int mxs_auart_probe(struct platform_device *pdev)
        s->mctrl_prev = 0;
 
        irq = platform_get_irq(pdev, 0);
-       if (irq < 0)
-               return irq;
+       if (irq < 0) {
+               ret = irq;
+               goto out_disable_clks;
+       }
 
        s->port.irq = irq;
        ret = devm_request_irq(&pdev->dev, irq, mxs_auart_irq_handle, 0,
                               dev_name(&pdev->dev), s);
        if (ret)
-               return ret;
+               goto out_disable_clks;
 
        platform_set_drvdata(pdev, s);
 
        ret = mxs_auart_init_gpios(s, &pdev->dev);
        if (ret) {
                dev_err(&pdev->dev, "Failed to initialize GPIOs.\n");
-               return ret;
+               goto out_disable_clks;
        }
 
        /*
@@ -1716,7 +1720,7 @@ static int mxs_auart_probe(struct platform_device *pdev)
         */
        ret = mxs_auart_request_gpio_irq(s);
        if (ret)
-               return ret;
+               goto out_disable_clks;
 
        auart_port[s->port.line] = s;
 
@@ -1724,7 +1728,7 @@ static int mxs_auart_probe(struct platform_device *pdev)
 
        ret = uart_add_one_port(&auart_driver, &s->port);
        if (ret)
-               goto out_disable_clks_free_qpio_irq;
+               goto out_free_qpio_irq;
 
        /* ASM9260 don't have version reg */
        if (is_asm9260_auart(s)) {
@@ -1738,13 +1742,15 @@ static int mxs_auart_probe(struct platform_device *pdev)
 
        return 0;
 
-out_disable_clks_free_qpio_irq:
-       if (s->clk)
-               clk_disable_unprepare(s->clk_ahb);
-       if (s->clk_ahb)
-               clk_disable_unprepare(s->clk_ahb);
+out_free_qpio_irq:
        mxs_auart_free_gpio_irq(s);
        auart_port[pdev->id] = NULL;
+
+out_disable_clks:
+       if (is_asm9260_auart(s)) {
+               clk_disable_unprepare(s->clk);
+               clk_disable_unprepare(s->clk_ahb);
+       }
        return ret;
 }
 
@@ -1755,6 +1761,10 @@ static int mxs_auart_remove(struct platform_device *pdev)
        uart_remove_one_port(&auart_driver, &s->port);
        auart_port[pdev->id] = NULL;
        mxs_auart_free_gpio_irq(s);
+       if (is_asm9260_auart(s)) {
+               clk_disable_unprepare(s->clk);
+               clk_disable_unprepare(s->clk_ahb);
+       }
 
        return 0;
 }