iwlagn: add support for waiting for notifications
In order to implement waiting for notifications,
add a structure that captures the information,
and a list of such structures that will be
traversed when a command is received from the
ucode.
Use sparse checking to make sure calls to the
prepare/wait/cancel functions are always nested
correctly.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 624f174..97657d0 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -910,6 +910,27 @@
(pkt->hdr.cmd != STATISTICS_NOTIFICATION) &&
(pkt->hdr.cmd != REPLY_TX);
+ /*
+ * Do the notification wait before RX handlers so
+ * even if the RX handler consumes the RXB we have
+ * access to it in the notification wait entry.
+ */
+ if (!list_empty(&priv->_agn.notif_waits)) {
+ struct iwl_notification_wait *w;
+
+ spin_lock(&priv->_agn.notif_wait_lock);
+ list_for_each_entry(w, &priv->_agn.notif_waits, list) {
+ if (w->cmd == pkt->hdr.cmd) {
+ w->triggered = true;
+ if (w->fn)
+ w->fn(priv, pkt);
+ }
+ }
+ spin_unlock(&priv->_agn.notif_wait_lock);
+
+ wake_up_all(&priv->_agn.notif_waitq);
+ }
+
/* Based on type of command response or notification,
* handle those that need handling via function in
* rx_handlers table. See iwl_setup_rx_handlers() */