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tty: tty_port: Add a kref object to the tty port

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Users of tty port need a way to refcount ports when hotplugging is
involved.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox
2009-11-30 13:17:14 +00:00
committed by Greg Kroah-Hartman
parent 338818fd80
commit 568aafc627
2 changed files with 30 additions and 0 deletions
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12
include/linux/tty.h
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@ -199,6 +199,8 @@ struct tty_port_operations {
/* FIXME: long term getting the tty argument *out* of this would be
good for consoles */
int (*activate)(struct tty_port *port, struct tty_struct *tty);
/* Called on the final put of a port */
void (*destruct)(struct tty_port *port);
};
struct tty_port {
@ -219,6 +221,7 @@ struct tty_port {
int drain_delay; /* Set to zero if no pure time
based drain is needed else
set to size of fifo */
struct kref kref; /* Ref counter */
};
/*
@ -461,6 +464,15 @@ extern int tty_write_lock(struct tty_struct *tty, int ndelay);
extern void tty_port_init(struct tty_port *port);
extern int tty_port_alloc_xmit_buf(struct tty_port *port);
extern void tty_port_free_xmit_buf(struct tty_port *port);
extern void tty_port_put(struct tty_port *port);
extern inline struct tty_port *tty_port_get(struct tty_port *port)
{
if (port)
kref_get(&port->kref);
return port;
}
extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
extern int tty_port_carrier_raised(struct tty_port *port);