i2c: axxia: disable clks in case of failure in probe

axxia_i2c_probe() does not disable clock in case of failure
in i2c_add_adapter(). Also it ignores returned value from
clk_prepare_enable().

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

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/drivers/i2c/busses/i2c-axxia.c b/drivers/i2c/busses/i2c-axxia.c
index d3bcaf4..4351a93 100644 (file)
--- a/drivers/i2c/busses/i2c-axxia.c
+++ b/drivers/i2c/busses/i2c-axxia.c
@@ -545,7 +545,11 @@ static int axxia_i2c_probe(struct platform_device *pdev)
                return ret;
        }
 
-       clk_prepare_enable(idev->i2c_clk);
+       ret = clk_prepare_enable(idev->i2c_clk);
+       if (ret) {
+               dev_err(&pdev->dev, "failed to enable clock\n");
+               return ret;
+       }
 
        i2c_set_adapdata(&idev->adapter, idev);
        strlcpy(idev->adapter.name, pdev->name, sizeof(idev->adapter.name));
@@ -558,7 +562,13 @@ static int axxia_i2c_probe(struct platform_device *pdev)
 
        platform_set_drvdata(pdev, idev);
 
-       return i2c_add_adapter(&idev->adapter);
+       ret = i2c_add_adapter(&idev->adapter);
+       if (ret) {
+               clk_disable_unprepare(idev->i2c_clk);
+               return ret;
+       }
+
+       return 0;
 }
 
 static int axxia_i2c_remove(struct platform_device *pdev)