From 6c451859552e1fc78f6589617482f9ff96d7ed8a Mon Sep 17 00:00:00 2001
From: Peter Hutterer <peter.hutterer@redhat.com>
Date: Mon, 20 Oct 2008 12:19:55 +1030
Subject: [PATCH] config: don't add duplicate devices through HAL.

If HAL is restarted, the device list is sent to the server again, leading
first to duplicate devices (and thus duplicate events), and later to a
FatalError "Too many input devices."

dev->config_info contains the UDI for the device. If the UDI of a new devices
is equal to one we already have in the device list, just ignore it.

Signed-off-by: Peter Hutterer <peter.hutterer@redhat.com>
---
 config/hal.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/config/hal.c b/config/hal.c
index 6573efed3..c29a573fc 100644
--- a/config/hal.c
+++ b/config/hal.c
@@ -166,6 +166,26 @@ get_prop_string_array(LibHalContext *hal_ctx, const char *udi, const char *prop)
     return ret;
 }
 
+static BOOL
+device_is_duplicate(char *config_info)
+{
+    DeviceIntPtr dev;
+
+    for (dev = inputInfo.devices; dev; dev = dev->next)
+    {
+        if (dev->config_info && (strcmp(dev->config_info, config_info) == 0))
+            return TRUE;
+    }
+
+    for (dev = inputInfo.off_devices; dev; dev = dev->next)
+    {
+        if (dev->config_info && (strcmp(dev->config_info, config_info) == 0))
+            return TRUE;
+    }
+
+    return FALSE;
+}
+
 static void
 device_added(LibHalContext *hal_ctx, const char *udi)
 {
@@ -228,6 +248,13 @@ device_added(LibHalContext *hal_ctx, const char *udi)
     }
     sprintf(config_info, "hal:%s", udi);
 
+    /* Check for duplicate devices */
+    if (device_is_duplicate(config_info))
+    {
+        LogMessage(X_WARNING, "config/hal: device %s already added. Ignoring.\n", name);
+        goto unwind;
+    }
+
     /* ok, grab options from hal.. iterate through all properties
     * and lets see if any of them are options that we can add */
     set = libhal_device_get_all_properties(hal_ctx, udi, &error);