From 750d70267679ddee10590c80ec621d890bd3d4a7 Mon Sep 17 00:00:00 2001
From: Peter Hutterer <peter@cs.unisa.edu.au>
Date: Sun, 3 Feb 2008 10:25:15 +1030
Subject: [PATCH] dix: Ensure enough memory for ClassesChangedEvent for a new
 device.

Before we enable the device through the driver, we size it up and make sure
that the events in the event list contain enough bytes for a possible
ClassesChangedEvent lateron.
---
 dix/devices.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/dix/devices.c b/dix/devices.c
index 0ffc798e8..38466f889 100644
--- a/dix/devices.c
+++ b/dix/devices.c
@@ -206,6 +206,10 @@ EnableDevice(DeviceIntPtr dev)
     DeviceIntRec dummyDev;
     DeviceIntPtr other;
     devicePresenceNotify ev;
+    int namelen = 0; /* dummy */
+    int evsize  = sizeof(xEvent);
+    int listlen;
+    EventListPtr evlist;
 
     for (prev = &inputInfo.off_devices;
 	 *prev && (*prev != dev);
@@ -238,6 +242,18 @@ EnableDevice(DeviceIntPtr dev)
         }
     }
 
+    /* Before actually enabling the device, we need to make sure the event
+     * list's events have enough memory for a ClassesChangedEvent from the
+     * device
+     */
+
+    SizeDeviceInfo(dev, &namelen, &evsize);
+
+    listlen = GetEventList(&evlist);
+    OsBlockSignals();
+    SetMinimumEventSize(evlist, listlen, evsize);
+    OsReleaseSignals();
+
     if ((*prev != dev) || !dev->inited ||
 	((ret = (*dev->deviceProc)(dev, DEVICE_ON)) != Success)) {
         ErrorF("[dix] couldn't enable device %d\n", dev->id);