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path: root/drivers/tty/pty.c
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Diffstat (limited to 'drivers/tty/pty.c')
-rw-r--r--drivers/tty/pty.c31
1 files changed, 16 insertions, 15 deletions
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index a9d256d6e909..e72ee629cead 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -88,19 +88,6 @@ static void pty_unthrottle(struct tty_struct *tty)
}
/**
- * pty_space - report space left for writing
- * @to: tty we are writing into
- *
- * Limit the buffer space used by ptys to 8k.
- */
-
-static int pty_space(struct tty_struct *to)
-{
- int n = tty_buffer_space_avail(to->port);
- return min(n, 8192);
-}
-
-/**
* pty_write - write to a pty
* @tty: the tty we write from
* @buf: kernel buffer of data
@@ -141,7 +128,7 @@ static int pty_write_room(struct tty_struct *tty)
{
if (tty->stopped)
return 0;
- return pty_space(tty->link);
+ return tty_buffer_space_avail(tty->link->port);
}
/**
@@ -210,6 +197,9 @@ static int pty_signal(struct tty_struct *tty, int sig)
{
struct pid *pgrp;
+ if (sig != SIGINT && sig != SIGQUIT && sig != SIGTSTP)
+ return -EINVAL;
+
if (tty->link) {
pgrp = tty_get_pgrp(tty->link);
if (pgrp)
@@ -222,10 +212,16 @@ static int pty_signal(struct tty_struct *tty, int sig)
static void pty_flush_buffer(struct tty_struct *tty)
{
struct tty_struct *to = tty->link;
+ struct tty_ldisc *ld;
if (!to)
return;
- /* tty_buffer_flush(to); FIXME */
+
+ ld = tty_ldisc_ref(to);
+ tty_buffer_flush(to, ld);
+ if (ld)
+ tty_ldisc_deref(ld);
+
if (to->packet) {
spin_lock_irq(&tty->ctrl_lock);
tty->ctrl_status |= TIOCPKT_FLUSHWRITE;
@@ -399,6 +395,7 @@ static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty,
goto err_put_module;
tty_set_lock_subclass(o_tty);
+ lockdep_set_subclass(&o_tty->termios_rwsem, TTY_LOCK_SLAVE);
if (legacy) {
/* We always use new tty termios data so we can do this
@@ -429,10 +426,14 @@ static int pty_common_install(struct tty_driver *driver, struct tty_struct *tty,
o_tty->link = tty;
tty_port_init(ports[0]);
tty_port_init(ports[1]);
+ tty_buffer_set_limit(ports[0], 8192);
+ tty_buffer_set_limit(ports[1], 8192);
o_tty->port = ports[0];
tty->port = ports[1];
o_tty->port->itty = o_tty;
+ tty_buffer_set_lock_subclass(o_tty->port);
+
tty_driver_kref_get(driver);
tty->count++;
o_tty->count++;