Commit 48978077 authored by Hannu Hartikainen's avatar Hannu Hartikainen Committed by Greg Kroah-Hartman
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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: default avatarHannu 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: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d3997fce

drivers/usb/class/cdc-acm.c

+5 −0
Original line number Diff line number Diff line
@@ -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) },