linux-kernel - [PATCH] i2c: axxia: disable clks in case of failure in probe

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Date:   Fri, 23 Sep 2016 11:15:26 +0200
From:   Alexey Khoroshilov <khoroshilov@...ras.ru>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     Alexey Khoroshilov <khoroshilov@...ras.ru>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        ldv-project@...uxtesting.org
Subject: [PATCH] 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@...ras.ru>
---
 drivers/i2c/busses/i2c-axxia.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-axxia.c b/drivers/i2c/busses/i2c-axxia.c
index d3bcaf4..4351a93 100644
--- 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)
-- 
2.7.4