USB_DEVICE(0x0424, 0x274e) can send data before cdc_acm is ready, causing garbage chars on the TTY causing stray input to the shell and/or login prompt.

Signed-off-by: Joakim Tjernlund joakim.tjernlund@infinera.com Cc: stable@vger.kernel.org --- drivers/usb/class/cdc-acm.c | 2 ++ 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index ded8d93834ca..d579b05a2c2b 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -1689,6 +1689,8 @@ static int acm_pre_reset(struct usb_interface *intf)

static const struct usb_device_id acm_ids[] = { /* quirky and broken devices */ + { USB_DEVICE(0x0424, 0x274e), /* Microchip Technology, Inc. (formerly SMSC) */ + .driver_info = DISABLE_ECHO, }, /* DISABLE ECHO in termios flag */ { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */ .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */ { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */