5.15-stable review patch. If anyone has any objections, please let me know.
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From: Łukasz Bartosik ukaszb@chromium.org
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: 4521f1613940 ("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... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/host/xhci-dbgtty.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/usb/host/xhci-dbgtty.c +++ b/drivers/usb/host/xhci-dbgtty.c @@ -537,6 +537,7 @@ static int dbc_tty_init(void) dbc_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; dbc_tty_driver->subtype = SERIAL_TYPE_NORMAL; dbc_tty_driver->init_termios = tty_std_termios; + dbc_tty_driver->init_termios.c_lflag &= ~ECHO; dbc_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; dbc_tty_driver->init_termios.c_ispeed = 9600;