This is a note to let you know that I've just added the patch titled
cdc-acm: Add DISABLE_ECHO quirk for Microchip/SMSC chip
to the 5.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
cdc-acm-add-disable_echo-quirk-for-microchip-smsc-chip.patch
and it can be found in the queue-5.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 03894573f2913181ee5aae0089f333b2131f2d4b Mon Sep 17 00:00:00 2001
From: Joakim Tjernlund <joakim.tjernlund@xxxxxxxxxxxx>
Date: Fri, 5 Jun 2020 12:54:18 +0200
Subject: cdc-acm: Add DISABLE_ECHO quirk for Microchip/SMSC chip
From: Joakim Tjernlund <joakim.tjernlund@xxxxxxxxxxxx>
commit 03894573f2913181ee5aae0089f333b2131f2d4b 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@xxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Acked-by: Oliver Neukum <oneukum@xxxxxxxx>
Link: https://lore.kernel.org/r/20200605105418.22263-1-joakim.tjernlund@xxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/class/cdc-acm.c | 2 ++
1 file changed, 2 insertions(+)
--- 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_inte
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 */
Patches currently in stable-queue which might be from joakim.tjernlund@xxxxxxxxxxxx are
queue-5.7/cdc-acm-add-disable_echo-quirk-for-microchip-smsc-chip.patch
