diff --git a/[refs] b/[refs]
index 4e01b893a127..b6ab9ceacb92 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 7ae810776a51dc4dc6580013b0f6ba0f34d2b165
+refs/heads/master: d3a571971e5af241074947fc80f6284677f6e014
diff --git a/trunk/drivers/net/wireless/iwlwifi/iwl-debugfs.c b/trunk/drivers/net/wireless/iwlwifi/iwl-debugfs.c
index 5c8377b9ad9b..d134301b553c 100644
--- a/trunk/drivers/net/wireless/iwlwifi/iwl-debugfs.c
+++ b/trunk/drivers/net/wireless/iwlwifi/iwl-debugfs.c
@@ -815,7 +815,9 @@ static ssize_t iwl_dbgfs_sleep_level_override_write(struct file *file,
 
 	priv->power_data.debug_sleep_level_override = value;
 
+	mutex_lock(&priv->mutex);
 	iwl_power_update_mode(priv, true);
+	mutex_unlock(&priv->mutex);
 
 	return count;
 }
diff --git a/trunk/drivers/net/wireless/iwlwifi/iwl-power.c b/trunk/drivers/net/wireless/iwlwifi/iwl-power.c
index 232dd1879baf..1a1a9f081cc7 100644
--- a/trunk/drivers/net/wireless/iwlwifi/iwl-power.c
+++ b/trunk/drivers/net/wireless/iwlwifi/iwl-power.c
@@ -303,7 +303,7 @@ static int iwl_set_power(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd)
 				sizeof(struct iwl_powertable_cmd), cmd);
 }
 
-
+/* priv->mutex must be held */
 int iwl_power_update_mode(struct iwl_priv *priv, bool force)
 {
 	int ret = 0;