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tty: add kernel-doc for more tty_port functions 

From the main tty_port functions, only tty_port_destroy() was
documented. Document more of them, so that we can reference them in
Documentation/ later in this series.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20211126081611.11001-19-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2021-11-26 09:16:06 +01:00 committed by Greg Kroah-Hartman
parent 3858128354
commit 3be491d74a
1 changed files with 52 additions and 2 deletions
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54
drivers/tty/tty_port.c
View File

@ -59,6 +59,15 @@ const struct tty_port_client_operations tty_port_default_client_ops = {
};
EXPORT_SYMBOL_GPL(tty_port_default_client_ops);
/**
* tty_port_init -- initialize tty_port
* @port: tty_port to initialize
*
* Initializes the state of struct tty_port. When a port was initialized using
* this function, one has to destroy the port by tty_port_destroy(). Either
* indirectly by using &tty_port refcounting (tty_port_put()) or directly if
* refcounting is not used.
*/
void tty_port_init(struct tty_port *port)
{
memset(port, 0, sizeof(*port));
@ -267,6 +276,13 @@ static void tty_port_destructor(struct kref *kref)
kfree(port);
}
/**
* tty_port_put -- drop a reference to tty_port
* @port: port to drop a reference of (can be NULL)
*
* The final put will destroy and free up the @port using
* @port->ops->destruct() hook, or using kfree() if not provided.
*/
void tty_port_put(struct tty_port *port)
{
if (port)
@ -312,6 +328,16 @@ void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty)
}
EXPORT_SYMBOL(tty_port_tty_set);
/**
* tty_port_shutdown - internal helper to shutdown the device
* @port: tty port to be shut down
* @tty: the associated tty
*
* It is used by tty_port_hangup() and tty_port_close(). Its task is to
* shutdown the device if it was initialized (note consoles remain
* functioning). It lowers DTR/RTS (if @tty has HUPCL set) and invokes
* @port->ops->shutdown().
*/
static void tty_port_shutdown(struct tty_port *port, struct tty_struct *tty)
{
mutex_lock(&port->mutex);
@ -559,7 +585,21 @@ static void tty_port_drain_delay(struct tty_port *port, struct tty_struct *tty)
schedule_timeout_interruptible(timeout);
}
/* Caller holds tty lock. */
/**
* tty_port_close_start - helper for tty->ops->close, part 1/2
* @port: tty_port of the device
* @tty: tty being closed
* @filp: passed file pointer
*
* Decrements and checks open count. Flushes the port if this is the last
* close. That means, dropping the data from the outpu buffer on the device and
* waiting for sending logic to finish. The rest of close handling is performed
* in tty_port_close_end().
*
* Locking: Caller holds tty lock.
*
* Return: 1 if this is the last close, otherwise 0
*/
int tty_port_close_start(struct tty_port *port,
struct tty_struct *tty, struct file *filp)
{
@ -605,7 +645,17 @@ int tty_port_close_start(struct tty_port *port,
}
EXPORT_SYMBOL(tty_port_close_start);
/* Caller holds tty lock */
/**
* tty_port_close_end - helper for tty->ops->close, part 2/2
* @port: tty_port of the device
* @tty: tty being closed
*
* This is a continuation of the first part: tty_port_close_start(). This
* should be called after turning off the device. It flushes the data from the
* line discipline and delays the close by @port->close_delay.
*
* Locking: Caller holds tty lock.
*/
void tty_port_close_end(struct tty_port *port, struct tty_struct *tty)
{
unsigned long flags;