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xhci: dbctty: disable ECHO flag by default

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commit 2b857d69a5e116150639a0c6c39c86cc329939ee upstream.

When /dev/ttyDBC0 device is created then by default ECHO flag
is set for the terminal device. However if data arrives from
a peer before application using /dev/ttyDBC0 applies its set
of terminal flags then the arriving data will be echoed which
might not be desired behavior.

Fixes: 4521f16139 ("xhci: dbctty: split dbc tty driver registration and unregistration functions.")
Cc: stable <stable@kernel.org>
Signed-off-by: Łukasz Bartosik <ukaszb@chromium.org>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/stable/20250610111802.18742-1-ukaszb%40chromium.org
Link: https://lore.kernel.org/r/20250627144127.3889714-4-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Łukasz Bartosik
2025-06-27 17:41:21 +03:00
committed by Greg Kroah-Hartman
parent 7609899eb6
commit 897d1170c2
1 changed files with 1 additions and 0 deletions
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1
drivers/usb/host/xhci-dbgtty.c
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@@ -585,6 +585,7 @@ int dbc_tty_init(void)
dbc_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; dbc_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
dbc_tty_driver->subtype = SERIAL_TYPE_NORMAL; dbc_tty_driver->subtype = SERIAL_TYPE_NORMAL;
dbc_tty_driver->init_termios = tty_std_termios; dbc_tty_driver->init_termios = tty_std_termios;
dbc_tty_driver->init_termios.c_lflag &= ~ECHO;
dbc_tty_driver->init_termios.c_cflag = dbc_tty_driver->init_termios.c_cflag =
B9600 | CS8 | CREAD | HUPCL | CLOCAL; B9600 | CS8 | CREAD | HUPCL | CLOCAL;
dbc_tty_driver->init_termios.c_ispeed = 9600; dbc_tty_driver->init_termios.c_ispeed = 9600;