[gnome-color-manager] Protect gcm_client_add_device() with a mutex to try and fix a libsane-related segfault

[Richard Hughes <rhughes src gnome org>]

commit 9ab1439abc2d2cf72a983969062cd17a3a679e5a
Author: Richard Hughes <richard hughsie com>
Date:   Mon Jun 14 09:50:04 2010 +0100

    Protect gcm_client_add_device() with a mutex to try and fix a libsane-related segfault

 src/gcm-client.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/src/gcm-client.c b/src/gcm-client.c
index f1e051c..06b5f2c 100644
--- a/src/gcm-client.c
+++ b/src/gcm-client.c
@@ -1226,10 +1226,14 @@ gcm_client_add_device (GcmClient *client, GcmDevice *device, GError **error)
 	const gchar *device_id;
 	GcmDevice *device_tmp = NULL;
 	GPtrArray *array;
+	static GStaticMutex mutex = G_STATIC_MUTEX_INIT;
 
 	g_return_val_if_fail (GCM_IS_CLIENT (client), FALSE);
 	g_return_val_if_fail (GCM_IS_DEVICE (device), FALSE);
 
+	/* lock */
+	g_static_mutex_lock (&mutex);
+
 	/* look to see if device already exists */
 	device_id = gcm_device_get_id (device);
 	device_tmp = gcm_client_get_device_by_id (client, device_id);
@@ -1261,6 +1265,9 @@ gcm_client_add_device (GcmClient *client, GcmDevice *device, GError **error)
 	/* all okay */
 	ret = TRUE;
 out:
+	/* unlock */
+	g_static_mutex_unlock (&mutex);
+
 	if (device_tmp != NULL)
 		g_object_unref (device_tmp);
 	return ret;