linux-kernel - [PATCH] media: mc-device: remove unnecessary __must

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Message-Id: <20230327112952.12287-1-sukbeom.kim@gmail.com>
Date:   Mon, 27 Mar 2023 20:29:52 +0900
From:   Jason Kim <sukbeom.kim@...il.com>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jason Kim <sukbeom.kim@...il.com>
Subject: [PATCH] media: mc-device: remove unnecessary __must_check

In the file mc-device.c, the function
media_device_register_entity_notify() does not need to have the
__must_check attribute since it returns only a value of 0.
Therefore, we can remove this attribute and change the function's
return type.

Signed-off-by: Jason Kim <sukbeom.kim@...il.com>
---
 drivers/media/mc/mc-device.c           | 3 +--
 drivers/media/usb/au0828/au0828-core.c | 9 ++-------
 include/media/media-device.h           | 5 ++---
 3 files changed, 5 insertions(+), 12 deletions(-)

diff --git a/drivers/media/mc/mc-device.c b/drivers/media/mc/mc-device.c
index 9e56d2ad6b94..0259ffbdcbc2 100644
--- a/drivers/media/mc/mc-device.c
+++ b/drivers/media/mc/mc-device.c
@@ -770,13 +770,12 @@ int __must_check __media_device_register(struct media_device *mdev,
 }
 EXPORT_SYMBOL_GPL(__media_device_register);
 
-int __must_check media_device_register_entity_notify(struct media_device *mdev,
+void media_device_register_entity_notify(struct media_device *mdev,
 					struct media_entity_notify *nptr)
 {
 	mutex_lock(&mdev->graph_mutex);
 	list_add_tail(&nptr->list, &mdev->entity_notify);
 	mutex_unlock(&mdev->graph_mutex);
-	return 0;
 }
 EXPORT_SYMBOL_GPL(media_device_register_entity_notify);
 
diff --git a/drivers/media/usb/au0828/au0828-core.c b/drivers/media/usb/au0828/au0828-core.c
index a8a72d5fbd12..64739f403663 100644
--- a/drivers/media/usb/au0828/au0828-core.c
+++ b/drivers/media/usb/au0828/au0828-core.c
@@ -627,14 +627,9 @@ static int au0828_media_device_register(struct au0828_dev *dev,
 	/* register entity_notify callback */
 	dev->entity_notify.notify_data = (void *) dev;
 	dev->entity_notify.notify = (void *) au0828_media_graph_notify;
-	ret = media_device_register_entity_notify(dev->media_dev,
+	media_device_register_entity_notify(dev->media_dev,
 						  &dev->entity_notify);
-	if (ret) {
-		dev_err(&udev->dev,
-			"Media Device register entity_notify Error: %d\n",
-			ret);
-		return ret;
-	}
+
 	/* set enable_source */
 	mutex_lock(&dev->media_dev->graph_mutex);
 	dev->media_dev->source_priv = (void *) dev;
diff --git a/include/media/media-device.h b/include/media/media-device.h
index 1345e6da688a..5fa89baf9666 100644
--- a/include/media/media-device.h
+++ b/include/media/media-device.h
@@ -373,7 +373,7 @@ void media_device_unregister_entity(struct media_entity *entity);
  *    media_entity_notify callbacks are invoked.
  */
 
-int __must_check media_device_register_entity_notify(struct media_device *mdev,
+void media_device_register_entity_notify(struct media_device *mdev,
 					struct media_entity_notify *nptr);
 
 /**
@@ -453,11 +453,10 @@ static inline int media_device_register_entity(struct media_device *mdev,
 static inline void media_device_unregister_entity(struct media_entity *entity)
 {
 }
-static inline int media_device_register_entity_notify(
+static inline void media_device_register_entity_notify(
 					struct media_device *mdev,
 					struct media_entity_notify *nptr)
 {
-	return 0;
 }
 static inline void media_device_unregister_entity_notify(
 					struct media_device *mdev,
-- 
2.34.1