From: Alexander Ponyatykh <lazyranma@gmail.com>
Date: Fri, 15 Nov 2019 02:19:01 +0300
Subject: fix re_initLibG15() to properly reset internal state.

Bug-Ubuntu: https://bugs.launchpad.net/ubuntu/+source/libusb/+bug/1357556
Forwarded: no
Last-Update: 2015-05-17

===================================================================
---
 libg15.c | 55 ++++++++++++++++++++++++++++---------------------------
 1 file changed, 28 insertions(+), 27 deletions(-)

diff --git a/libg15.c b/libg15.c
index 31b2bd6..369ed40 100644
--- a/libg15.c
+++ b/libg15.c
@@ -283,19 +283,36 @@ static usb_dev_handle * findAndOpenG15() {
     return keyboard_device;
 }
 
-
-int re_initLibG15()
+/* reset the keyboard, returning it to a known state */
+static int closeKeyboardDevice()
 {
+    int retval = G15_NO_ERROR;
 
-    usb_init();
+    enospc_slowdown = shared_device = g15_keys_endpoint = g15_lcd_endpoint = 0;
+    found_devicetype = -1;
 
-  /**
-     *  usb_find_busses and usb_find_devices both report the number of devices
-     *  / busses added / removed since the last call. since this is the first
-   *  call we have to return values != 0 or else we didnt find anything */
+    if (keyboard_device){
+#ifndef SUN_LIBUSB
+        retval = usb_release_interface (keyboard_device, 0);
+        usleep(50*1000);
+#endif
+#if 0
+        retval = usb_reset(keyboard_device);
+        usleep(50*1000);
+#endif
+        usb_close(keyboard_device);
+        keyboard_device=0;
+        return retval;
+    }
+    return -1;
+}
 
-    if (!usb_find_devices())
-        return G15_ERROR_OPENING_USB_DEVICE;
+int re_initLibG15()
+{
+    closeKeyboardDevice();
+
+    usb_find_busses();
+    usb_find_devices();
 
     keyboard_device = findAndOpenG15();
     if (!keyboard_device)
@@ -327,28 +344,12 @@ int initLibG15()
     return retval;
 }
 
-/* reset the keyboard, returning it to a known state */
 int exitLibG15()
 {
-    int retval = G15_NO_ERROR;
-    if (keyboard_device){
-#ifndef SUN_LIBUSB
-        retval = usb_release_interface (keyboard_device, 0);
-        usleep(50*1000);
-#endif
-#if 0
-        retval = usb_reset(keyboard_device);
-        usleep(50*1000);
-#endif
-        usb_close(keyboard_device);
-        keyboard_device=0;
-        pthread_mutex_destroy(&libusb_mutex);
-        return retval;
-    }
-    return -1;
+    pthread_mutex_destroy(&libusb_mutex);
+    return closeKeyboardDevice();
 }
 
-
 static void dumpPixmapIntoLCDFormat(unsigned char *lcd_buffer, unsigned char const *data)
 {
 /*