path: root/include
diff options
authorAlan Cox <alan@linux.intel.com>2009-10-06 16:06:11 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2009-12-11 15:18:04 -0800
commit64bc397914265a9ead8d73b63bb31ab3bdd25f67 (patch)
treedc96d1737d3d70bbdebaea7e0f0aedd1377e1000 /include
parent894cb91770f7794f1a17db4df2d83999b197da24 (diff)
tty_port: add "tty_port_open" helper
For the moment this just moves the USB logic over and fixes the 'what if we open and hangup at the same time' race noticed by Oliver Neukum. Signed-off-by: Alan Cox <alan@linux.intel.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Oliver Neukum <oliver@neukum.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include')
1 files changed, 9 insertions, 1 deletions
diff --git a/include/linux/tty.h b/include/linux/tty.h
index f0f43d08d8b..6352ac257fc 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -190,9 +190,15 @@ struct tty_port_operations {
/* Control the DTR line */
void (*dtr_rts)(struct tty_port *port, int raise);
/* Called when the last close completes or a hangup finishes
- IFF the port was initialized. Do not use to free resources */
+ IFF the port was initialized. Do not use to free resources. Called
+ under the port mutex to serialize against activate/shutdowns */
void (*shutdown)(struct tty_port *port);
void (*drop)(struct tty_port *port);
+ /* Called under the port mutex from tty_port_open, serialized using
+ the port mutex */
+ /* 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);
struct tty_port {
@@ -467,6 +473,8 @@ extern int tty_port_close_start(struct tty_port *port,
extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);
extern void tty_port_close(struct tty_port *port,
struct tty_struct *tty, struct file *filp);
+extern int tty_port_open(struct tty_port *port,
+ struct tty_struct *tty, struct file *filp);
extern inline int tty_port_users(struct tty_port *port)
return port->count + port->blocked_open;