patch "Goodix Fingerprint device is not a modem" added to usb-linus

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

Goodix Fingerprint device is not a modem

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-linus 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 hopefully also be merged in Linus's tree for the next -rc kernel release.

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

From c9de574e76bc3862f34b9fca77dfb88ceffd2556 Mon Sep 17 00:00:00 2001
From: Yorick de Wid <[email protected]>
Date: Sat, 13 Feb 2021 15:49:02 +0100
Subject: Goodix Fingerprint device is not a modem

The CDC ACM driver is false matching the Goodix Fingerprint device against the USB_CDC_ACM_PROTO_AT_V25TER.

The Goodix Fingerprint device is a biometrics sensor that should be handled in user-space. libfprint has some support for Goodix fingerprint sensors, although not for this particular one. It is possible that the vendor allocates a PID per OEM (Lenovo, Dell etc). If this happens to be the case then more devices from the same vendor could potentially match the ACM modem module table.

---
 drivers/usb/class/cdc-acm.c | 5 +++++
 1 file changed, 5 insertions(+)

index 37f824b59daa..39ddb5585ded 100644
@@ -1935,6 +1935,11 @@ static const struct usb_device_id acm_ids[] = {
 	.driver_info = SEND_ZERO_PACKET,
 	},
 
+	/* Exclude Goodix Fingerprint Reader */
+	{ USB_DEVICE(0x27c6, 0x5395),
+	.driver_info = IGNORE_DEVICE,
+	},
+
 	/* control interfaces without any protocol set */
 	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
 		USB_CDC_PROTO_NONE) },

2.30.1