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TTY: fix DTR being raised on hang up

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Make sure to check ASYNC_INITIALISED before raising DTR when waking up
from blocked open in tty_port_block_til_ready.

Currently DTR could get raised at hang up as a blocked process would
raise DTR unconditionally before checking for hang up and returning.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2013-03-07 15:55:50 +01:00 • committed by Greg Kroah-Hartman
parent 31ca020b57
commit e584a02cf5
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/tty_port.c
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@ -388,7 +388,7 @@ int tty_port_block_til_ready(struct tty_port *port,
while (1) { while (1) {
/* Indicate we are open */ /* 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); tty_port_raise_dtr_rts(port);
prepare_to_wait(&port->open_wait, &wait, TASK_INTERRUPTIBLE); prepare_to_wait(&port->open_wait, &wait, TASK_INTERRUPTIBLE);