linux-kernel - [PATCH v2 1/6] media: ar0521: Refactor ar0521_power

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Message-Id: <20240816-smatch-clock-v2-1-c63105db07e8@chromium.org>
Date: Fri, 16 Aug 2024 12:31:59 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Sakari Ailus <sakari.ailus@...ux.intel.com>, 
 Krzysztof Hałasa <khalasa@...p.pl>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Sylwester Nawrocki <s.nawrocki@...sung.com>, 
 Andrzej Hajda <andrzej.hajda@...el.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Kevin Hilman <khilman@...libre.com>, Jerome Brunet <jbrunet@...libre.com>, 
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc: Hans Verkuil <hverkuil-cisco@...all.nl>, linux-media@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-amlogic@...ts.infradead.org, 
 linux-staging@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
 Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH v2 1/6] media: ar0521: Refactor ar0521_power_off()

Factor out all the power off logic, except the clk_disable_unprepare(),
to a new function __ar0521_power_off().

This allows ar0521_power_on() to explicitly clean-out the clock during
the error-path.

The following smatch warning is fixed:
drivers/media/i2c/ar0521.c:912 ar0521_power_on() warn: 'sensor->extclk' from clk_prepare_enable() not released on lines: 912.

Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/i2c/ar0521.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/media/i2c/ar0521.c b/drivers/media/i2c/ar0521.c
index 09331cf95c62..56a724b4d47e 100644
--- a/drivers/media/i2c/ar0521.c
+++ b/drivers/media/i2c/ar0521.c
@@ -835,14 +835,12 @@ static const struct initial_reg {
 	     be(0x0707)), /* 3F44: couple k factor 2 */
 };
 
-static int ar0521_power_off(struct device *dev)
+static void __ar0521_power_off(struct device *dev)
 {
 	struct v4l2_subdev *sd = dev_get_drvdata(dev);
 	struct ar0521_dev *sensor = to_ar0521_dev(sd);
 	int i;
 
-	clk_disable_unprepare(sensor->extclk);
-
 	if (sensor->reset_gpio)
 		gpiod_set_value(sensor->reset_gpio, 1); /* assert RESET signal */
 
@@ -850,6 +848,16 @@ static int ar0521_power_off(struct device *dev)
 		if (sensor->supplies[i])
 			regulator_disable(sensor->supplies[i]);
 	}
+}
+
+static int ar0521_power_off(struct device *dev)
+{
+	struct v4l2_subdev *sd = dev_get_drvdata(dev);
+	struct ar0521_dev *sensor = to_ar0521_dev(sd);
+
+	clk_disable_unprepare(sensor->extclk);
+	__ar0521_power_off(dev);
+
 	return 0;
 }
 
@@ -908,7 +916,8 @@ static int ar0521_power_on(struct device *dev)
 
 	return 0;
 off:
-	ar0521_power_off(dev);
+	clk_disable_unprepare(sensor->extclk);
+	__ar0521_power_off(dev);
 	return ret;
 }
 

-- 
2.46.0.184.g6999bdac58-goog