diff options
| author | Joakim Tjernlund <joakim.tjernlund@infinera.com> | 2020-06-05 12:54:18 +0200 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2020-06-30 23:17:09 -0400 |
| commit | a313eeaf80b647aa7bb4b8c2003290ffa6fbdf26 (patch) | |
| tree | acaf04228594e11d7895729c3af8e9d5abba3c46 /drivers | |
| parent | a81f69d6ff96b88e23335f90ce53f4d1cfa8a817 (diff) | |
cdc-acm: Add DISABLE_ECHO quirk for Microchip/SMSC chip
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@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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/class/cdc-acm.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index e8b9b27937ed..ea7883e1fbe2 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -1721,6 +1721,8 @@ 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 */ |