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

commit 03894573f2 upstream.

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
Acked-by: Oliver Neukum <oneukum@suse.com>
Link: https://lore.kernel.org/r/20200605105418.22263-1-joakim.tjernlund@infinera.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Joakim Tjernlund 2020-06-05 12:54:18 +02:00 committed by Sasha Levin
parent d6522bc320
commit d9a74e4550
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/class/cdc-acm.c
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@ -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 */