linux-kernel - [PATCH v1 1/1] leds: is31fl319x: Wrap mutex_destroy() for devm_add_action_or

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Date:   Wed, 28 Dec 2022 11:32:38 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Pavel Machek <pavel@....cz>,
        Vincent Knecht <vincent.knecht@...loo.org>,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Cc:     Lee Jones <lee@...nel.org>, Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH v1 1/1] leds: is31fl319x: Wrap mutex_destroy() for devm_add_action_or_rest()

Clang complains that devm_add_action() takes a parameter with a wrong type:

warning: cast from 'void (*)(struct mutex *)' to 'void (*)(void *)' converts to incompatible function type [-Wcast-function-type-strict]
    err = devm_add_action(dev, (void (*)(void *))mutex_destroy, &is31->lock);
                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    1 warning generated.

It appears that the commit e1af5c815586 ("leds: is31fl319x: Fix devm vs.
non-devm ordering") missed two things:
- while mention devm_add_action_or_reset() the actual change got
  devm_add_action() call by unknown reason
- strictly speaking the parameter is not compatible by type

Fix both issues by switching to devm_add_action_or_reset() and adding a
wrapper for mutex_destroy() call.

Reported-by: kernel test robot <lkp@...el.com>
Fixes: e1af5c815586 ("leds: is31fl319x: Fix devm vs. non-devm ordering")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Tested-by: Vincent Knecht <vincent.knecht@...loo.org>
---

v2: added tag (Vincent), Cc'ed to Lee

 drivers/leds/leds-is31fl319x.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/leds/leds-is31fl319x.c b/drivers/leds/leds-is31fl319x.c
index b2f4c4ec7c56..7c908414ac7e 100644
--- a/drivers/leds/leds-is31fl319x.c
+++ b/drivers/leds/leds-is31fl319x.c
@@ -495,6 +495,11 @@ static inline int is31fl3196_db_to_gain(u32 dezibel)
 	return dezibel / IS31FL3196_AUDIO_GAIN_DB_STEP;
 }
 
+static void is31f1319x_mutex_destroy(void *lock)
+{
+	mutex_destroy(lock);
+}
+
 static int is31fl319x_probe(struct i2c_client *client)
 {
 	struct is31fl319x_chip *is31;
@@ -511,7 +516,7 @@ static int is31fl319x_probe(struct i2c_client *client)
 		return -ENOMEM;
 
 	mutex_init(&is31->lock);
-	err = devm_add_action(dev, (void (*)(void *))mutex_destroy, &is31->lock);
+	err = devm_add_action_or_reset(dev, is31f1319x_mutex_destroy, &is31->lock);
 	if (err)
 		return err;
 
-- 
2.35.1