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@chromium.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;
 }
 

-- 
2.46.0.76.ge559c4bf1a-goog

On Tue, Aug 13, 2024 at 12:13:50PM +0000, Ricardo Ribalda wrote:
> 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@chromium.org>
> ---

To be honest, maybe I should remove the clk_prepare_enable/disable() from the
check_unwind.c.  Or at least move them into their own check so that I can
tweak this kind of thing more easily.

regards,
dan carpenter