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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/include/media/dvbdev.h
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@@ -86,8 +86,8 @@
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  * @priv:		private data
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  * @device:		pointer to struct device
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  * @module:		pointer to struct module
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- * @mfe_shared:		mfe shared: indicates mutually exclusive frontends
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- *			Thie usage of this flag is currently deprecated
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+ * @mfe_shared:		indicates mutually exclusive frontends.
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+ *			Use of this flag is currently deprecated.
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  * @mfe_dvbdev:		Frontend device in use, in the case of MFE
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  * @mfe_lock:		Lock to prevent using the other frontends when MFE is
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  *			used.
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@@ -126,6 +126,7 @@
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  * struct dvb_device - represents a DVB device node
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  *
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  * @list_head:	List head with all DVB devices
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+ * @ref:	reference counter
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  * @fops:	pointer to struct file_operations
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  * @adapter:	pointer to the adapter that holds this device node
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  * @type:	type of the device, as defined by &enum dvb_device_type.
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@@ -156,6 +157,7 @@
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  */
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 struct dvb_device {
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 	struct list_head list_head;
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+	struct kref ref;
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 	const struct file_operations *fops;
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 	struct dvb_adapter *adapter;
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 	enum dvb_device_type type;
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@@ -186,6 +188,35 @@
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 	void *priv;
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 };
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+
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+/**
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+ * struct dvbdevfops_node - fops nodes registered in dvbdevfops_list
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+ *
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+ * @fops:		Dynamically allocated fops for ->owner registration
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+ * @type:		type of dvb_device
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+ * @template:		dvb_device used for registration
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+ * @list_head:		list_head for dvbdevfops_list
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+ */
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+struct dvbdevfops_node {
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+	struct file_operations *fops;
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+	enum dvb_device_type type;
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+	const struct dvb_device *template;
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+	struct list_head list_head;
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+};
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+
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+/**
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+ * dvb_device_get - Increase dvb_device reference
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+ *
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+ * @dvbdev:	pointer to struct dvb_device
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+ */
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+struct dvb_device *dvb_device_get(struct dvb_device *dvbdev);
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+
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+/**
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+ * dvb_device_put - Decrease dvb_device reference
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+ *
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+ * @dvbdev:	pointer to struct dvb_device
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+ */
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+void dvb_device_put(struct dvb_device *dvbdev);
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 /**
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  * dvb_register_adapter - Registers a new DVB adapter
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@@ -231,28 +262,16 @@
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 /**
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  * dvb_remove_device - Remove a registered DVB device
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  *
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- * This does not free memory.  To do that, call dvb_free_device().
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+ * This does not free memory. dvb_free_device() will do that when
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+ * reference counter is empty
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  *
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  * @dvbdev:	pointer to struct dvb_device
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  */
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 void dvb_remove_device(struct dvb_device *dvbdev);
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-/**
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- * dvb_free_device - Free memory occupied by a DVB device.
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- *
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- * Call dvb_unregister_device() before calling this function.
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- *
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- * @dvbdev:	pointer to struct dvb_device
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- */
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-void dvb_free_device(struct dvb_device *dvbdev);
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 /**
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  * dvb_unregister_device - Unregisters a DVB device
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- *
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- * This is a combination of dvb_remove_device() and dvb_free_device().
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- * Using this function is usually a mistake, and is often an indicator
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- * for a use-after-free bug (when a userspace process keeps a file
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- * handle to a detached device).
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  *
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  * @dvbdev:	pointer to struct dvb_device
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  */
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@@ -293,8 +312,8 @@
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  *
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  * @adap:			pointer to &struct dvb_adapter
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  */
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-static inline struct media_device
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-*dvb_get_media_controller(struct dvb_adapter *adap)
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+static inline struct media_device *
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+dvb_get_media_controller(struct dvb_adapter *adap)
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 {
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 	return adap->mdev;
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 }
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@@ -385,7 +404,7 @@
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  * with dvb_module_probe() should use dvb_module_release() to unbind.
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  *
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  * Return:
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- *	On success, return an &struct i2c_client, pointing the the bound
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+ *	On success, return an &struct i2c_client, pointing to the bound
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  *	I2C device. %NULL otherwise.
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  *
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  * .. note::