Commit 03894573 authored by Joakim Tjernlund's avatar Joakim Tjernlund Committed by Greg Kroah-Hartman

cdc-acm: Add DISABLE_ECHO quirk for Microchip/SMSC chip

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: default avatarJoakim Tjernlund <joakim.tjernlund@infinera.com>
Cc: stable@vger.kernel.org
Acked-by: default avatarOliver Neukum <oneukum@suse.com>
Link: https://lore.kernel.org/r/20200605105418.22263-1-joakim.tjernlund@infinera.comSigned-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 1ddcb71a
...@@ -1689,6 +1689,8 @@ static int acm_pre_reset(struct usb_interface *intf) ...@@ -1689,6 +1689,8 @@ static int acm_pre_reset(struct usb_interface *intf)
static const struct usb_device_id acm_ids[] = { static const struct usb_device_id acm_ids[] = {
/* quirky and broken devices */ /* 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 */ { USB_DEVICE(0x076d, 0x0006), /* Denso Cradle CU-321 */
.driver_info = NO_UNION_NORMAL, },/* has no union descriptor */ .driver_info = NO_UNION_NORMAL, },/* has no union descriptor */
{ USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */ { USB_DEVICE(0x17ef, 0x7000), /* Lenovo USB modem */
......
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