[PATCH v2] i2c: hix5hd2: Make sure clk is disabled in remove

[Andi Shyti <andi.shyti@kernel.org>]

From: Alexey Khoroshilov <khoroshilov@ispras.ru>

pm_runtime_set_suspended() does not lead to call of suspend callback,
so clk may be left undisabled in hix5hd2_i2c_remove().

By the way, the patch adds error handling for clk_prepare_enable().

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

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
---
Hi,

Look what I fished from the far December 2017 :)

It looked better to respin it rather than replying to such an old
mail.

I haven't made any modification to the patch exept for a little
rebase conflict. Here's a full changelog, anyway.

Changelog
=========
v1 -> v2:
 - Fished this out from the muddy pond.
 - Added my SoB
 - Fixed rebase conflict

Andi

 drivers/i2c/busses/i2c-hix5hd2.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/i2c/busses/i2c-hix5hd2.c b/drivers/i2c/busses/i2c-hix5hd2.c
index 0e34cbaca22dc..ec775ffefa9fc 100644
--- a/drivers/i2c/busses/i2c-hix5hd2.c
+++ b/drivers/i2c/busses/i2c-hix5hd2.c
@@ -421,7 +421,11 @@ static int hix5hd2_i2c_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev, "cannot get clock\n");
 		return PTR_ERR(priv->clk);
 	}
-	clk_prepare_enable(priv->clk);
+	ret = clk_prepare_enable(priv->clk);
+	if (ret) {
+		dev_err(&pdev->dev, "cannot enable clock\n");
+		return ret;
+	}
 
 	strscpy(priv->adap.name, "hix5hd2-i2c", sizeof(priv->adap.name));
 	priv->dev = &pdev->dev;
@@ -469,8 +473,10 @@ static int hix5hd2_i2c_remove(struct platform_device *pdev)
 	struct hix5hd2_i2c_priv *priv = platform_get_drvdata(pdev);
 
 	i2c_del_adapter(&priv->adap);
-	pm_runtime_disable(priv->dev);
-	pm_runtime_set_suspended(priv->dev);
+
+	/* Make sure priv->clk is disabled */
+	pm_runtime_force_suspend(priv->dev);
+
 	clk_disable_unprepare(priv->clk);
 
 	return 0;
-- 
2.40.1