diff options
| -rw-r--r-- | drivers/net/wireless/intel/iwlwifi/mei/main.c | 57 |
1 files changed, 37 insertions, 20 deletions
diff --git a/drivers/net/wireless/intel/iwlwifi/mei/main.c b/drivers/net/wireless/intel/iwlwifi/mei/main.c index 64a637ef199c..c0142093c768 100644 --- a/drivers/net/wireless/intel/iwlwifi/mei/main.c +++ b/drivers/net/wireless/intel/iwlwifi/mei/main.c @@ -152,6 +152,8 @@ struct iwl_mei_filters { * @csa_throttle_end_wk: used when &csa_throttled is true * @data_q_lock: protects the access to the data queues which are * accessed without the mutex. + * @netdev_work: used to defer registering and unregistering of the netdev to + * avoid taking the rtnl lock in the SAP messages handlers. * @sap_seq_no: the sequence number for the SAP messages * @seq_no: the sequence number for the SAP messages * @dbgfs_dir: the debugfs dir entry @@ -172,6 +174,7 @@ struct iwl_mei { bool device_down; struct delayed_work csa_throttle_end_wk; spinlock_t data_q_lock; + struct work_struct netdev_work; atomic_t sap_seq_no; atomic_t seq_no; @@ -591,6 +594,33 @@ static rx_handler_result_t iwl_mei_rx_handler(struct sk_buff **pskb) return res; } +static void iwl_mei_netdev_work(struct work_struct *wk) +{ + struct iwl_mei *mei = + container_of(wk, struct iwl_mei, netdev_work); + struct net_device *netdev; + + /* + * First take rtnl and only then the mutex to avoid an ABBA + * with iwl_mei_set_netdev() + */ + rtnl_lock(); + mutex_lock(&iwl_mei_mutex); + + netdev = rcu_dereference_protected(iwl_mei_cache.netdev, + lockdep_is_held(&iwl_mei_mutex)); + if (netdev) { + if (mei->amt_enabled) + netdev_rx_handler_register(netdev, iwl_mei_rx_handler, + mei); + else + netdev_rx_handler_unregister(netdev); + } + + mutex_unlock(&iwl_mei_mutex); + rtnl_unlock(); +} + static void iwl_mei_handle_rx_start_ok(struct mei_cl_device *cldev, const struct iwl_sap_me_msg_start_ok *rsp, @@ -743,38 +773,23 @@ static void iwl_mei_handle_amt_state(struct mei_cl_device *cldev, const struct iwl_sap_msg_dw *dw) { struct iwl_mei *mei = mei_cldev_get_drvdata(cldev); - struct net_device *netdev; - /* - * First take rtnl and only then the mutex to avoid an ABBA - * with iwl_mei_set_netdev() - */ - rtnl_lock(); mutex_lock(&iwl_mei_mutex); - netdev = rcu_dereference_protected(iwl_mei_cache.netdev, - lockdep_is_held(&iwl_mei_mutex)); - if (mei->amt_enabled == !!le32_to_cpu(dw->val)) goto out; mei->amt_enabled = dw->val; - if (mei->amt_enabled) { - if (netdev) - netdev_rx_handler_register(netdev, iwl_mei_rx_handler, mei); - + if (mei->amt_enabled) iwl_mei_set_init_conf(mei); - } else { - if (iwl_mei_cache.ops) - iwl_mei_cache.ops->rfkill(iwl_mei_cache.priv, false); - if (netdev) - netdev_rx_handler_unregister(netdev); - } + else if (iwl_mei_cache.ops) + iwl_mei_cache.ops->rfkill(iwl_mei_cache.priv, false, false); + + schedule_work(&mei->netdev_work); out: mutex_unlock(&iwl_mei_mutex); - rtnl_unlock(); } static void iwl_mei_handle_nic_owner(struct mei_cl_device *cldev, @@ -1827,6 +1842,7 @@ static int iwl_mei_probe(struct mei_cl_device *cldev, iwl_mei_csa_throttle_end_wk); init_waitqueue_head(&mei->get_ownership_wq); spin_lock_init(&mei->data_q_lock); + INIT_WORK(&mei->netdev_work, iwl_mei_netdev_work); mei_cldev_set_drvdata(cldev, mei); mei->cldev = cldev; @@ -1989,6 +2005,7 @@ static void iwl_mei_remove(struct mei_cl_device *cldev) */ cancel_work_sync(&mei->send_csa_msg_wk); cancel_delayed_work_sync(&mei->csa_throttle_end_wk); + cancel_work_sync(&mei->netdev_work); /* * If someone waits for the ownership, let him know that we are going |