From: Alan Cox <alan@redhat.com>
Date: Fri, 2 Jan 2009 13:46:43 +0000 (+0000)
Subject: tty: tty port zero baud open
X-Git-Tag: tegra-9.12.3~1641^2~32
X-Git-Url: https://nv-tegra.nvidia.com/r/gitweb?p=linux-2.6.git;a=commitdiff_plain;h=7834909f1eb96ba7c49ca2b9e3a69b500a2cff76

tty: tty port zero baud open

If we have no speed set at some point then we should not raise DTR/RTS at
that point when opening as the tty is not ready

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/drivers/char/tty_port.c b/drivers/char/tty_port.c
index ff94182b381..0723664fe0a 100644
--- a/drivers/char/tty_port.c
+++ b/drivers/char/tty_port.c
@@ -216,7 +216,8 @@ int tty_port_block_til_ready(struct tty_port *port,
 
 	while (1) {
 		/* Indicate we are open */
-		tty_port_raise_dtr_rts(port);
+		if (tty->termios->c_cflag & CBAUD)
+			tty_port_raise_dtr_rts(port);
 
 		set_current_state(TASK_INTERRUPTIBLE);
 		/* Check for a hangup or uninitialised port. Return accordingly */