[PATCH 08/10] i2c: designware-platdrv: Check return value from clk_prepare_enable()

[ulf.hansson@linaro.org (Ulf Hansson)]

As clk_prepare_enable() can fail, let's not ignore the error in the
->runtime_resume() callback, but instead propagate it.

This change decreases the callers of i2c_dw_plat_prepare_clk() down to
one, which seems like a justification of removing it. Instead let's call
clk_disable_unprepare() directly when needed.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
---
 drivers/i2c/busses/i2c-designware-platdrv.c | 25 ++++++++++---------------
 1 file changed, 10 insertions(+), 15 deletions(-)

diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 95a9f4e..2b91af3 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -308,25 +308,15 @@ static void dw_i2c_plat_complete(struct device *dev)
 #endif
 
 #ifdef CONFIG_PM
-static int i2c_dw_plat_prepare_clk(struct dw_i2c_dev *i_dev, bool prepare)
-{
-	if (IS_ERR(i_dev->clk))
-		return PTR_ERR(i_dev->clk);
-
-	if (prepare)
-		return clk_prepare_enable(i_dev->clk);
-
-	clk_disable_unprepare(i_dev->clk);
-	return 0;
-}
-
 static int dw_i2c_plat_suspend(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
 
 	i2c_dw_disable(i_dev);
-	i2c_dw_plat_prepare_clk(i_dev, false);
+
+	if (!IS_ERR(i_dev->clk))
+		clk_disable_unprepare(i_dev->clk);
 
 	return 0;
 }
@@ -335,10 +325,15 @@ static int dw_i2c_plat_resume(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
+	int ret;
 
-	i2c_dw_plat_prepare_clk(i_dev, true);
-	i2c_dw_init(i_dev);
+	if (!IS_ERR(i_dev->clk)) {
+		ret = clk_prepare_enable(i_dev->clk);
+		if (ret)
+			return ret;
+	}
 
+	i2c_dw_init(i_dev);
 	return 0;
 }
 
-- 
1.9.1