linux-kernel - [PATCH v2 3/6] media: i2c: s5c73m3: Move clk

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Message-Id: <20240816-smatch-clock-v2-3-c63105db07e8@chromium.org>
Date: Fri, 16 Aug 2024 12:32:01 +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 3/6] media: i2c: s5c73m3: Move clk_prepare to its own
 function

Smatch is very confused by a clk_prepare_enable() being called in an
error-path. Fix this warning by moving the clk_prepare_enable() to its
own function.

drivers/media/i2c/s5c73m3/s5c73m3-core.c:1425 __s5c73m3_power_off() warn: 'state->clock' from clk_prepare_enable() not released on lines: 1425.

Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/i2c/s5c73m3/s5c73m3-core.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/media/i2c/s5c73m3/s5c73m3-core.c b/drivers/media/i2c/s5c73m3/s5c73m3-core.c
index e89e888f028e..7716dfe2b8c9 100644
--- a/drivers/media/i2c/s5c73m3/s5c73m3-core.c
+++ b/drivers/media/i2c/s5c73m3/s5c73m3-core.c
@@ -1392,6 +1392,16 @@ static int __s5c73m3_power_on(struct s5c73m3 *state)
 	return ret;
 }
 
+/*
+ * This function has been created just to avoid a smatch warning,
+ * please do not merge into __s5c73m3_power_off() until you have
+ * confirmed that it does not introduce a new warning.
+ */
+static void s5c73m3_enable_clk(struct s5c73m3 *state)
+{
+	clk_prepare_enable(state->clock);
+}
+
 static int __s5c73m3_power_off(struct s5c73m3 *state)
 {
 	int i, ret;
@@ -1421,7 +1431,8 @@ static int __s5c73m3_power_off(struct s5c73m3 *state)
 				 state->supplies[i].supply, r);
 	}
 
-	clk_prepare_enable(state->clock);
+	s5c73m3_enable_clk(state);
+
 	return ret;
 }
 

-- 
2.46.0.184.g6999bdac58-goog