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>
Thu, 24 Jun 2021 12:31:04 +0000 (14:31 +0200)
commit4897807753e078655a78de39ed76044d784f3e63
tree93928c81a2f42fd3a8c83ad03a14d9913a0335af
parentd3997fce189fc4423169c51a81ba5ca01144d886
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