[PATCH v3 6/6] TTY: fix close of uninitialised ports
From: Johan Hovold <hidden>
Date: 2013-03-07 14:57:05
Also in:
lkml
Subsystem:
the rest, tty layer and serial drivers · Maintainers:
Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
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 <redacted> --- 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 048cc85..d028df3 100644
--- a/drivers/tty/tty_port.c
+++ b/drivers/tty/tty_port.c@@ -454,14 +454,16 @@ 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