patch "tty: do not set TTY_IO_ERROR flag if console port" added to tty-linus

patch "tty: do not set TTY_IO_ERROR flag if console port" added to tty-linus

[gregkh]

This is a note to let you know that I've just added the patch titled

    tty: do not set TTY_IO_ERROR flag if console port

to my tty git tree which can be found at
    git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git
in the tty-linus branch.

The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.

If you have any questions about this process, please let me know.


>From 2a48602615e0a2f563549c7d5c8d507f904cf96e Mon Sep 17 00:00:00 2001
From: Chanho Park <parkch98@gmail.com>
Date: Thu, 22 Nov 2018 18:23:47 +0900
Subject: tty: do not set TTY_IO_ERROR flag if console port

Since Commit 761ed4a94582 ('tty: serial_core: convert uart_close to use
tty_port_close') and Commit 4dda864d7307 ('tty: serial_core: Fix serial
console crash on port shutdown), a serial port which is used as
console can be stuck when logging out if there is a remained process.
After logged out, agetty will try to grab the serial port but it will
be failed because the previous process did not release the port
correctly. To fix this, TTY_IO_ERROR bit should not be enabled of
tty_port_close if the port is console port.

Reproduce step:
- Run background processes from serial console
$ while true; do sleep 10; done &

- Log out
$ logout
-> Stuck

- Read journal log by journalctl | tail
Jan 28 16:07:01 ubuntu systemd[1]: Stopped Serial Getty on ttyAMA0.
Jan 28 16:07:01 ubuntu systemd[1]: Started Serial Getty on ttyAMA0.
Jan 28 16:07:02 ubuntu agetty[1643]: /dev/ttyAMA0: not a tty

Fixes: 761ed4a94582 ("tty: serial_core: convert uart_close to use tty_port_close")
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Rob Herring <robh@kernel.org>
Cc: Jiri Slaby <jslaby@suse.com>
Signed-off-by: Chanho Park <parkch98@gmail.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/tty_port.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
index cb6075096a5b..044c3cbdcfa4 100644
--- a/drivers/tty/tty_port.c
+++ b/drivers/tty/tty_port.c
@@ -633,7 +633,8 @@ void tty_port_close(struct tty_port *port, struct tty_struct *tty,
 	if (tty_port_close_start(port, tty, filp) == 0)
 		return;
 	tty_port_shutdown(port, tty);
-	set_bit(TTY_IO_ERROR, &tty->flags);
+	if (!port->console)
+		set_bit(TTY_IO_ERROR, &tty->flags);
 	tty_port_close_end(port, tty);
 	tty_port_tty_set(port, NULL);
 }
-- 
2.19.2