i2c: ocores: add missed clk_disable_unprepare() on failure paths

clk_disable_unprepare() is missed on failure paths in ocores_i2c_probe().

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

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Acked-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/drivers/i2c/busses/i2c-ocores.c b/drivers/i2c/busses/i2c-ocores.c
index dfa7a4b..ac88a52 100644 (file)
--- a/drivers/i2c/busses/i2c-ocores.c
+++ b/drivers/i2c/busses/i2c-ocores.c
@@ -379,6 +379,7 @@ static int ocores_i2c_of_probe(struct platform_device *pdev,
                        if (!clock_frequency_present) {
                                dev_err(&pdev->dev,
                                        "Missing required parameter 'opencores,ip-clock-frequency'\n");
+                               clk_disable_unprepare(i2c->clk);
                                return -ENODEV;
                        }
                        i2c->ip_clock_khz = clock_frequency / 1000;
@@ -467,20 +468,21 @@ static int ocores_i2c_probe(struct platform_device *pdev)
                default:
                        dev_err(&pdev->dev, "Unsupported I/O width (%d)\n",
                                i2c->reg_io_width);
-                       return -EINVAL;
+                       ret = -EINVAL;
+                       goto err_clk;
                }
        }
 
        ret = ocores_init(&pdev->dev, i2c);
        if (ret)
-               return ret;
+               goto err_clk;
 
        init_waitqueue_head(&i2c->wait);
        ret = devm_request_irq(&pdev->dev, irq, ocores_isr, 0,
                               pdev->name, i2c);
        if (ret) {
                dev_err(&pdev->dev, "Cannot claim IRQ\n");
-               return ret;
+               goto err_clk;
        }
 
        /* hook up driver to tree */
@@ -494,7 +496,7 @@ static int ocores_i2c_probe(struct platform_device *pdev)
        ret = i2c_add_adapter(&i2c->adap);
        if (ret) {
                dev_err(&pdev->dev, "Failed to add adapter\n");
-               return ret;
+               goto err_clk;
        }
 
        /* add in known devices to the bus */
@@ -504,6 +506,10 @@ static int ocores_i2c_probe(struct platform_device *pdev)
        }
 
        return 0;
+
+err_clk:
+       clk_disable_unprepare(i2c->clk);
+       return ret;
 }
 
 static int ocores_i2c_remove(struct platform_device *pdev)