linux-kernel - [PATCH v2 2/6] media: i2c: ov5645: Refactor ov5645_set_power

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Message-Id: <20240816-smatch-clock-v2-2-c63105db07e8@chromium.org>
Date: Fri, 16 Aug 2024 12:32:00 +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 2/6] media: i2c: ov5645: Refactor ov5645_set_power_off()

Factor out all the power off logic, except clk_disable_unprepare(), to a
new function __ov5645_set_power_off().

This allows ov5645_set_power_on() to excplicitly clean-out the clock
during the error-path.

The following smatch warning is fixed:
drivers/media/i2c/ov5645.c:690 ov5645_set_power_on() warn: 'ov5645->xclk' from clk_prepare_enable() not released on lines: 690.

Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/i2c/ov5645.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c
index 6c2d221f6973..0c32bd2940ec 100644
--- a/drivers/media/i2c/ov5645.c
+++ b/drivers/media/i2c/ov5645.c
@@ -635,7 +635,7 @@ static int ov5645_set_register_array(struct ov5645 *ov5645,
 	return 0;
 }
 
-static int ov5645_set_power_off(struct device *dev)
+static void __ov5645_set_power_off(struct device *dev)
 {
 	struct v4l2_subdev *sd = dev_get_drvdata(dev);
 	struct ov5645 *ov5645 = to_ov5645(sd);
@@ -643,8 +643,16 @@ static int ov5645_set_power_off(struct device *dev)
 	ov5645_write_reg(ov5645, OV5645_IO_MIPI_CTRL00, 0x58);
 	gpiod_set_value_cansleep(ov5645->rst_gpio, 1);
 	gpiod_set_value_cansleep(ov5645->enable_gpio, 0);
-	clk_disable_unprepare(ov5645->xclk);
 	regulator_bulk_disable(OV5645_NUM_SUPPLIES, ov5645->supplies);
+}
+
+static int ov5645_set_power_off(struct device *dev)
+{
+	struct v4l2_subdev *sd = dev_get_drvdata(dev);
+	struct ov5645 *ov5645 = to_ov5645(sd);
+
+	__ov5645_set_power_off(dev);
+	clk_disable_unprepare(ov5645->xclk);
 
 	return 0;
 }
@@ -686,7 +694,8 @@ static int ov5645_set_power_on(struct device *dev)
 	return 0;
 
 exit:
-	ov5645_set_power_off(dev);
+	__ov5645_set_power_off(dev);
+	clk_disable_unprepare(ov5645->xclk);
 	return ret;
 }
 

-- 
2.46.0.184.g6999bdac58-goog