diff options
Diffstat (limited to 'drivers/tty/tty_port.c')
| -rw-r--r-- | drivers/tty/tty_port.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c index 3f746c8eb0dd..bcc15f75646c 100644 --- a/drivers/tty/tty_port.c +++ b/drivers/tty/tty_port.c @@ -458,6 +458,10 @@ static void tty_port_drain_delay(struct tty_port *port, struct tty_struct *tty) schedule_timeout_interruptible(timeout); } +/* Caller holds tty lock. + * NB: may drop and reacquire tty lock (in tty_wait_until_sent_from_close()) + * so tty and tty port may have changed state (but not hung up or reopened). + */ int tty_port_close_start(struct tty_port *port, struct tty_struct *tty, struct file *filp) { @@ -506,6 +510,7 @@ int tty_port_close_start(struct tty_port *port, } EXPORT_SYMBOL(tty_port_close_start); +/* Caller holds tty lock */ void tty_port_close_end(struct tty_port *port, struct tty_struct *tty) { unsigned long flags; @@ -528,6 +533,15 @@ void tty_port_close_end(struct tty_port *port, struct tty_struct *tty) } EXPORT_SYMBOL(tty_port_close_end); +/** + * tty_port_close + * + * Caller holds tty lock + * + * NB: may drop and reacquire tty lock (in tty_port_close_start()-> + * tty_wait_until_sent_from_close()) so tty and tty_port may have changed + * state (but not hung up or reopened). + */ void tty_port_close(struct tty_port *port, struct tty_struct *tty, struct file *filp) { |