4.14-stable review patch. If anyone has any objections, please let me know.
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From: Chanho Park parkch98@gmail.com
commit 2a48602615e0a2f563549c7d5c8d507f904cf96e upstream.
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(-)
--- a/drivers/tty/tty_port.c +++ b/drivers/tty/tty_port.c @@ -639,7 +639,8 @@ void tty_port_close(struct tty_port *por 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); }