From ba65c34068a836ae393565a6a8260a4e96709816 Mon Sep 17 00:00:00 2001
From: Peter Hutterer <peter@cs.unisa.edu.au>
Date: Mon, 23 Apr 2007 10:08:48 +0930
Subject: Remove driver from list if no device is associated any more.

This effectively stops the driver from hotplugging new devices. Devices have
to be added with the dbus hotplugging events.
---
 src/evdev.c       |  8 +++++++
 src/evdev.h       |  2 ++
 src/evdev_brain.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++---
 3 files changed, 69 insertions(+), 3 deletions(-)

diff --git a/src/evdev.c b/src/evdev.c
index f506997..5455062 100644
--- a/src/evdev.c
+++ b/src/evdev.c
@@ -461,6 +461,14 @@ EvdevCorePreInit(InputDriverPtr drv, IDevPtr dev, int flags)
     if (pEvdev->devices && pEvdev->devices->pInfo)
 	return pEvdev->devices->pInfo;
 
+    /* In some cases pEvdev->devices is NULL, but on the next
+     * evdevRescanDevices the device suddenly appears. If we return NULL here,
+     * the server will clean up and the sudden appearance of the device will
+     * segfault. We need to remove the driver from the list to avoid this.
+     * No. I don't know why it just appears. (whot)
+     */
+    evdevRemoveDriver(pEvdev);
+
     return NULL;
 }
 
diff --git a/src/evdev.h b/src/evdev.h
index c6e9188..81abbb6 100644
--- a/src/evdev.h
+++ b/src/evdev.h
@@ -256,6 +256,8 @@ Bool evdevStart (InputDriverPtr drv);
 Bool evdevNewDriver (evdevDriverPtr driver);
 Bool evdevGetBits (int fd, evdevBitsPtr bits);
 void evdevRemoveDevice (evdevDevicePtr device);
+void evdevDeleteDevice (evdevDevicePtr device);
+void evdevRemoveDriver (evdevDriverPtr device);
 
 int EvdevBtnInit (DeviceIntPtr device);
 int EvdevBtnOn (DeviceIntPtr device);
diff --git a/src/evdev_brain.c b/src/evdev_brain.c
index d0d1ac6..03506c4 100644
--- a/src/evdev_brain.c
+++ b/src/evdev_brain.c
@@ -555,16 +555,24 @@ evdevNewDriver (evdevDriverPtr driver)
 void
 evdevRemoveDevice (evdevDevicePtr pEvdev)
 {
-    evdevDriverPtr driver;
+    evdevDriverPtr driver, prev;
     evdevDevicePtr *device;
 
-    for (driver = evdev_drivers; driver; driver = driver->next) {
+    prev = evdev_drivers;
+
+    for (driver = evdev_drivers; driver; prev = driver, driver = driver->next) {
         for (device = &driver->devices; *device; device = &(*device)->next) {
             if (*device == pEvdev) {
                 *device = pEvdev->next;
-                xf86DeleteInput(pEvdev->pInfo, 0);
                 pEvdev->next = NULL;
+                /* driver without device? get rid of it, otherwise it'll
+                 * auto-hotplug when a device is plugged in again.
+                 */
                 if (!driver->devices)
+                {
+                    evdevDeleteDevice(pEvdev);
+                    evdevRemoveDriver(driver);
+                }
                 return;
             }
         }
@@ -600,3 +608,51 @@ evdevGetBits (int fd, evdevBitsPtr bits)
     return TRUE;
 }
 
+/**
+ * Free memory associated with device.
+ */
+void
+evdevDeleteDevice(evdevDevicePtr pEvdev)
+{
+    /* pEvdev->pInp is freed in xf86DeleteInput() when
+     * DeleteInputDeviceRequest is called. */
+    xfree(pEvdev->name);
+    xfree(pEvdev->phys);
+    xfree(pEvdev->device);
+    xfree(pEvdev);
+}
+
+/**
+ * Remove a driver from the list, free memory.
+ */
+void evdevRemoveDriver(evdevDriverPtr drv)
+{
+    evdevDriverPtr driver, prev; 
+    evdevDevicePtr device;
+
+    if (drv == evdev_drivers)
+        evdev_drivers = evdev_drivers->next;
+    else
+        for (prev = evdev_drivers, driver = prev->next; driver; 
+                prev = driver, driver = driver->next) 
+        {
+            if (driver == drv)
+            {
+                prev->next = driver->next;
+            }
+        }
+
+    xfree(drv->name);
+    xfree(drv->phys);
+    xfree(drv->device);
+
+    device = drv->devices;
+    while(device)
+    {
+        evdevDeleteDevice(device);
+        device = device->next;
+    }
+
+    xfree(drv);
+}
+
-- 
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