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TTY: synclink: 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 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 2013-04-12 10:32:28 +02:00 committed by Greg Kroah-Hartman
parent 3ec857ffe3
commit 78c6cccadb
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/synclink.c
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@ -3308,7 +3308,7 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
port->blocked_open++;
while (1) {
if (tty->termios.c_cflag & CBAUD)
if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags))
tty_port_raise_dtr_rts(port);
set_current_state(TASK_INTERRUPTIBLE);