[PATCH v3 01/11] leds: led-class: Add missing put_device() to led_put()

From: Hans de Goede <hdegoede@redhat.com>
To: Mark Gross <markgross@kernel.org>,
	Andy Shevchenko <andy@kernel.org>, Pavel Machek <pavel@ucw.cz>,
	Lee Jones <lee@kernel.org>,
	Linus Walleij <linus.walleij@linaro.org>,
	Daniel Scally <djrscally@gmail.com>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	Sakari Ailus <sakari.ailus@linux.intel.com>
Cc: Hans de Goede <hdegoede@redhat.com>,
	platform-driver-x86@vger.kernel.org, linux-leds@vger.kernel.org,
	linux-gpio@vger.kernel.org, Kate Hsuan <hpa@redhat.com>,
	Mark Pearson <markpearson@lenovo.com>,
	Andy Yeh <andy.yeh@intel.com>, Yao Hao <yao.hao@intel.com>,
	linux-media@vger.kernel.org
Subject: [PATCH v3 01/11] leds: led-class: Add missing put_device() to led_put()
Date: Fri, 16 Dec 2022 12:30:03 +0100	[thread overview]
Message-ID: <20221216113013.126881-2-hdegoede@redhat.com> (raw)
In-Reply-To: <20221216113013.126881-1-hdegoede@redhat.com>

led_put() is used to "undo" a successful of_led_get() call,
of_led_get() uses class_find_device_by_of_node() which returns
a reference to the device which must be free-ed with put_device()
when the caller is done with it.

Add a put_device() call to led_put() to free the reference returned
by class_find_device_by_of_node().

And also add a put_device() in the error-exit case of try_module_get()
failing.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/leds/led-class.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index 6a8ea94834fa..7391d2cf1370 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -241,8 +241,10 @@ struct led_classdev *of_led_get(struct device_node *np, int index)
 
 	led_cdev = dev_get_drvdata(led_dev);
 
-	if (!try_module_get(led_cdev->dev->parent->driver->owner))
+	if (!try_module_get(led_cdev->dev->parent->driver->owner)) {
+		put_device(led_cdev->dev);
 		return ERR_PTR(-ENODEV);
+	}
 
 	return led_cdev;
 }
@@ -255,6 +257,7 @@ EXPORT_SYMBOL_GPL(of_led_get);
 void led_put(struct led_classdev *led_cdev)
 {
 	module_put(led_cdev->dev->parent->driver->owner);
+	put_device(led_cdev->dev);
 }
 EXPORT_SYMBOL_GPL(led_put);
 
-- 
2.38.1

