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path: root/drivers/tty/tty_port.c
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Diffstat (limited to 'drivers/tty/tty_port.c')
-rw-r--r--drivers/tty/tty_port.c111
1 files changed, 80 insertions, 31 deletions
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
index b7ff59d..121aeb9 100644
--- a/drivers/tty/tty_port.c
+++ b/drivers/tty/tty_port.c
@@ -132,6 +132,7 @@ EXPORT_SYMBOL(tty_port_free_xmit_buf);
*/
void tty_port_destroy(struct tty_port *port)
{
+ cancel_work_sync(&port->buf.work);
tty_buffer_free_all(port);
}
EXPORT_SYMBOL(tty_port_destroy);
@@ -196,12 +197,24 @@ void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty)
}
EXPORT_SYMBOL(tty_port_tty_set);
-static void tty_port_shutdown(struct tty_port *port)
+static void tty_port_shutdown(struct tty_port *port, struct tty_struct *tty)
{
mutex_lock(&port->mutex);
- if (port->ops->shutdown && !port->console &&
- test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags))
+ if (port->console)
+ goto out;
+
+ if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) {
+ /*
+ * Drop DTR/RTS if HUPCL is set. This causes any attached
+ * modem to hang up the line.
+ */
+ if (tty && C_HUPCL(tty))
+ tty_port_lower_dtr_rts(port);
+
+ if (port->ops->shutdown)
port->ops->shutdown(port);
+ }
+out:
mutex_unlock(&port->mutex);
}
@@ -215,24 +228,58 @@ static void tty_port_shutdown(struct tty_port *port)
void tty_port_hangup(struct tty_port *port)
{
+ struct tty_struct *tty;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
port->count = 0;
port->flags &= ~ASYNC_NORMAL_ACTIVE;
- if (port->tty) {
- set_bit(TTY_IO_ERROR, &port->tty->flags);
- tty_kref_put(port->tty);
- }
+ tty = port->tty;
+ if (tty)
+ set_bit(TTY_IO_ERROR, &tty->flags);
port->tty = NULL;
spin_unlock_irqrestore(&port->lock, flags);
+ tty_port_shutdown(port, tty);
+ tty_kref_put(tty);
wake_up_interruptible(&port->open_wait);
wake_up_interruptible(&port->delta_msr_wait);
- tty_port_shutdown(port);
}
EXPORT_SYMBOL(tty_port_hangup);
/**
+ * tty_port_tty_hangup - helper to hang up a tty
+ *
+ * @port: tty port
+ * @check_clocal: hang only ttys with CLOCAL unset?
+ */
+void tty_port_tty_hangup(struct tty_port *port, bool check_clocal)
+{
+ struct tty_struct *tty = tty_port_tty_get(port);
+
+ if (tty && (!check_clocal || !C_CLOCAL(tty))) {
+ tty_hangup(tty);
+ tty_kref_put(tty);
+ }
+}
+EXPORT_SYMBOL_GPL(tty_port_tty_hangup);
+
+/**
+ * tty_port_tty_wakeup - helper to wake up a tty
+ *
+ * @port: tty port
+ */
+void tty_port_tty_wakeup(struct tty_port *port)
+{
+ struct tty_struct *tty = tty_port_tty_get(port);
+
+ if (tty) {
+ tty_wakeup(tty);
+ tty_kref_put(tty);
+ }
+}
+EXPORT_SYMBOL_GPL(tty_port_tty_wakeup);
+
+/**
* tty_port_carrier_raised - carrier raised check
* @port: tty port
*
@@ -350,7 +397,7 @@ int tty_port_block_til_ready(struct tty_port *port,
while (1) {
/* Indicate we are open */
- if (tty->termios.c_cflag & CBAUD)
+ if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags))
tty_port_raise_dtr_rts(port);
prepare_to_wait(&port->open_wait, &wait, TASK_INTERRUPTIBLE);
@@ -395,6 +442,20 @@ int tty_port_block_til_ready(struct tty_port *port,
}
EXPORT_SYMBOL(tty_port_block_til_ready);
+static void tty_port_drain_delay(struct tty_port *port, struct tty_struct *tty)
+{
+ unsigned int bps = tty_get_baud_rate(tty);
+ long timeout;
+
+ if (bps > 1200) {
+ timeout = (HZ * 10 * port->drain_delay) / bps;
+ timeout = max_t(long, timeout, HZ / 10);
+ } else {
+ timeout = 2 * HZ;
+ }
+ schedule_timeout_interruptible(timeout);
+}
+
int tty_port_close_start(struct tty_port *port,
struct tty_struct *tty, struct file *filp)
{
@@ -427,31 +488,19 @@ int tty_port_close_start(struct tty_port *port,
set_bit(ASYNCB_CLOSING, &port->flags);
tty->closing = 1;
spin_unlock_irqrestore(&port->lock, flags);
- /* Don't block on a stalled port, just pull the chain */
- if (tty->flow_stopped)
- tty_driver_flush_buffer(tty);
- if (test_bit(ASYNCB_INITIALIZED, &port->flags) &&
- port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
- tty_wait_until_sent_from_close(tty, port->closing_wait);
- if (port->drain_delay) {
- unsigned int bps = tty_get_baud_rate(tty);
- long timeout;
-
- if (bps > 1200)
- timeout = max_t(long,
- (HZ * 10 * port->drain_delay) / bps, HZ / 10);
- else
- timeout = 2 * HZ;
- schedule_timeout_interruptible(timeout);
+
+ if (test_bit(ASYNCB_INITIALIZED, &port->flags)) {
+ /* Don't block on a stalled port, just pull the chain */
+ if (tty->flow_stopped)
+ tty_driver_flush_buffer(tty);
+ if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
+ tty_wait_until_sent_from_close(tty, port->closing_wait);
+ if (port->drain_delay)
+ tty_port_drain_delay(port, tty);
}
/* Flush the ldisc buffering */
tty_ldisc_flush(tty);
- /* Drop DTR/RTS if HUPCL is set. This causes any attached modem to
- hang up the line */
- if (tty->termios.c_cflag & HUPCL)
- tty_port_lower_dtr_rts(port);
-
/* Don't call port->drop for the last reference. Callers will want
to drop the last active reference in ->shutdown() or the tty
shutdown path */
@@ -486,7 +535,7 @@ void tty_port_close(struct tty_port *port, struct tty_struct *tty,
{
if (tty_port_close_start(port, tty, filp) == 0)
return;
- tty_port_shutdown(port);
+ tty_port_shutdown(port, tty);
set_bit(TTY_IO_ERROR, &tty->flags);
tty_port_close_end(port, tty);
tty_port_tty_set(port, NULL);