USB: cdc-acm: blacklist Heimann USB Appset device
authorHannu Hartikainen <hannu@hrtk.in>
Tue, 22 Jun 2021 14:14:54 +0000 (17:14 +0300)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 14 Jul 2021 14:55:37 +0000 (16:55 +0200)
commit022d22a311bb86b483684fda80b9367f8ed293de
tree83d618d0d1990a527fc26f4481b82cee06d7107a
parentf9d9db593dcd29c225fd85e0ff92b1a539876795
USB: cdc-acm: blacklist Heimann USB Appset device

commit 4897807753e078655a78de39ed76044d784f3e63 upstream.

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