[PATCH] platform/x86: dell-uart-backlight: switch to devm_mutex_init()

[chitranshmandhaniya@gmail.com]

From: Chitransh Mandhaniya <Chitransh_Mandhaniya@dell.com>

Replace mutex_init() with devm_mutex_init() so that the mutex is
automatically destroyed on driver removal via devres. The driver was
missing a mutex_destroy() call on the teardown path.

Suggested-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Chitransh Mandhaniya <Chitransh_Mandhaniya@dell.com>
---
 drivers/platform/x86/dell/dell-uart-backlight.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/dell/dell-uart-backlight.c b/drivers/platform/x86/dell/dell-uart-backlight.c
index f323a667dc2d..2ed2f00d8c49 100644
--- a/drivers/platform/x86/dell/dell-uart-backlight.c
+++ b/drivers/platform/x86/dell/dell-uart-backlight.c
@@ -279,7 +279,9 @@ static int dell_uart_bl_serdev_probe(struct serdev_device *serdev)
 	if (!dell_bl)
 		return -ENOMEM;
 
-	mutex_init(&dell_bl->mutex);
+	ret = devm_mutex_init(dev, &dell_bl->mutex);
+	if (ret)
+		return ret;
 	init_waitqueue_head(&dell_bl->wait_queue);
 	dell_bl->dev = dev;
 
-- 
2.43.0