This is a note to let you know that I've just added the patch titled

USB: cdc-acm: blacklist Heimann USB Appset device

to my usb git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git in the usb-testing branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will be merged to the usb-next branch sometime soon, after it passes testing, and the merge window is open.

If you have any questions about this process, please let me know.

From 4897807753e078655a78de39ed76044d784f3e63 Mon Sep 17 00:00:00 2001

From: Hannu Hartikainen hannu@hrtk.in Date: Tue, 22 Jun 2021 17:14:54 +0300 Subject: USB: cdc-acm: blacklist Heimann USB Appset device

The device (32a7:0000 Heimann Sensor GmbH USB appset demo) claims to be a CDC-ACM device in its descriptors but in fact is not. If it is run with echo disabled it returns garbled data, probably due to something that happens in the TTY layer. And when run with echo enabled (the default), it will mess up the calibration data of the sensor the first time any data is sent to the device.

In short, I had a bad time after connecting the sensor and trying to get it to work. I hope blacklisting it in the cdc-acm driver will save someone else a bit of trouble.

Signed-off-by: Hannu Hartikainen hannu@hrtk.in Cc: stable stable@vger.kernel.org Link: https://lore.kernel.org/r/20210622141454.337948-1-hannu@hrtk.in Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/class/cdc-acm.c | 5 +++++ 1 file changed, 5 insertions(+)

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index ca7a61190dd9..d50b606d09aa 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -1959,6 +1959,11 @@ static const struct usb_device_id acm_ids[] = { .driver_info = IGNORE_DEVICE, },

+ /* Exclude Heimann Sensor GmbH USB appset demo */ + { USB_DEVICE(0x32a7, 0x0000), + .driver_info = IGNORE_DEVICE, + }, + /* control interfaces without any protocol set */ { USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM, USB_CDC_PROTO_NONE) },