From cab81f679f08beefc85a7582990cce2f276b6190 Mon Sep 17 00:00:00 2001
From: Aleksander Morgado <aleksander@aleksander.es>
Date: Thu, 18 May 2017 12:54:37 +0200
Subject: [PATCH] blacklist: ignore default Linux USB Serial Gadget

Blacklist the default VID:PID for the Linux USB Serial Gadget in ACM
mode:

{LINUX}/drivers/usb/gadget/legacy/serial.c
  #define GS_VENDOR_ID       0x0525  /* NetChip */
  #define GS_CDC_PRODUCT_ID  0xa4a7  /* ... as CDC-ACM */

This should never be reused for real products by hardware
manufacturers, but anyway...

Patch actually ported from downstream Ubuntu:
https://bugs.launchpad.net/ubuntu/+source/modemmanager/+bug/1105352
---
 src/77-mm-usb-device-blacklist.rules | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/77-mm-usb-device-blacklist.rules b/src/77-mm-usb-device-blacklist.rules
index 4c6a7f90..1c688fec 100644
--- a/src/77-mm-usb-device-blacklist.rules
+++ b/src/77-mm-usb-device-blacklist.rules
@@ -188,4 +188,7 @@ ATTRS{idVendor}=="064B", ATTRS{idProduct}=="7825", ENV{ID_MM_DEVICE_IGNORE}="1"
 ATTRS{idVendor}=="1209", ATTRS{idProduct}=="2300", ENV{ID_MM_DEVICE_IGNORE}="1"
 ATTRS{idVendor}=="1209", ATTRS{idProduct}=="2301", ENV{ID_MM_DEVICE_IGNORE}="1"
 
+# Netchip Technology, Inc. Linux-USB Serial Gadget (CDC ACM mode)
+ATTRS{idVendor}=="0525", ATTRS{idProduct}=="a4a7", ENV{ID_MM_DEVICE_IGNORE}="1"
+
 LABEL="mm_usb_device_blacklist_end"