Make sure we do not make tty-driver callbacks or wait for port to drain
on uninitialised ports (e.g. when open failed) in
tty_port_close_start().
No callback, such as flush_buffer or wait_until_sent, needs to be made
on a port that has never been opened. Neither does it make much sense to
add drain delay for an uninitialised port.
Currently a drain delay of up to two seconds could be added when a tty
fails to open.
Signed-off-by: Johan Hovold <jhovold@xxxxxxxxx>
---
drivers/tty/tty_port.c | 18 ++++++++++--------
1 file changed, 10 insertions(+), 8 deletions(-)
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
index ce4b591..e73ac90 100644
--- a/drivers/tty/tty_port.c
+++ b/drivers/tty/tty_port.c
@@ -451,14 +451,16 @@ 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)
- tty_port_drain_delay(port, tty);
+
+ 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);
--
1.8.1.1
--
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