iwlwifi: introduce iwl_sta_id_or_broadcast
There are now five places where we need to
look up the station ID, but the sta pointer
may be NULL due to mac80211 passing that to
indicate a certain special state.
Replace all these by a new inline function,
called iwl_sta_id_or_broadcast(), and add
documentation about when to use it.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-tx.c b/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
index c402bfc..18b1546 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
@@ -567,10 +567,7 @@
hdr_len = ieee80211_hdrlen(fc);
/* Find index into station table for destination station */
- if (!info->control.sta)
- sta_id = priv->hw_params.bcast_sta_id;
- else
- sta_id = iwl_sta_id(info->control.sta);
+ sta_id = iwl_sta_id_or_broadcast(priv, info->control.sta);
if (sta_id == IWL_INVALID_STATION) {
IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
hdr->addr1);
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 47563cf..d7a9aea 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -3081,17 +3081,9 @@
return -EOPNOTSUPP;
}
- if (sta) {
- sta_id = iwl_sta_id(sta);
-
- if (sta_id == IWL_INVALID_STATION) {
- IWL_DEBUG_MAC80211(priv, "leave - %pM not in station map.\n",
- sta->addr);
- return -EINVAL;
- }
- } else {
- sta_id = priv->hw_params.bcast_sta_id;
- }
+ sta_id = iwl_sta_id_or_broadcast(priv, sta);
+ if (sta_id == IWL_INVALID_STATION)
+ return -EINVAL;
mutex_lock(&priv->mutex);
iwl_scan_cancel_timeout(priv, 100);
diff --git a/drivers/net/wireless/iwlwifi/iwl-sta.c b/drivers/net/wireless/iwlwifi/iwl-sta.c
index 85ed235..2eafba6 100644
--- a/drivers/net/wireless/iwlwifi/iwl-sta.c
+++ b/drivers/net/wireless/iwlwifi/iwl-sta.c
@@ -972,24 +972,16 @@
unsigned long flags;
int i;
- if (sta) {
- sta_id = iwl_sta_id(sta);
-
- if (sta_id == IWL_INVALID_STATION) {
- IWL_DEBUG_MAC80211(priv, "leave - %pM not initialised.\n",
- sta->addr);
- return;
- }
- } else
- sta_id = priv->hw_params.bcast_sta_id;
-
-
if (iwl_scan_cancel(priv)) {
/* cancel scan failed, just live w/ bad key and rely
briefly on SW decryption */
return;
}
+ sta_id = iwl_sta_id_or_broadcast(priv, sta);
+ if (sta_id == IWL_INVALID_STATION)
+ return;
+
spin_lock_irqsave(&priv->sta_lock, flags);
priv->stations[sta_id].sta.key.tkip_rx_tsc_byte2 = (u8) iv32;
diff --git a/drivers/net/wireless/iwlwifi/iwl-sta.h b/drivers/net/wireless/iwlwifi/iwl-sta.h
index c2a453a..5b1b1e4 100644
--- a/drivers/net/wireless/iwlwifi/iwl-sta.h
+++ b/drivers/net/wireless/iwlwifi/iwl-sta.h
@@ -107,4 +107,33 @@
return ((struct iwl_station_priv_common *)sta->drv_priv)->sta_id;
}
+
+/**
+ * iwl_sta_id_or_broadcast - return sta_id or broadcast sta
+ * @priv: iwl priv
+ * @sta: mac80211 station
+ *
+ * In certain circumstances mac80211 passes a station pointer
+ * that may be %NULL, for example during TX or key setup. In
+ * that case, we need to use the broadcast station, so this
+ * inline wraps that pattern.
+ */
+static inline int iwl_sta_id_or_broadcast(struct iwl_priv *priv,
+ struct ieee80211_sta *sta)
+{
+ int sta_id;
+
+ if (!sta)
+ return priv->hw_params.bcast_sta_id;
+
+ sta_id = iwl_sta_id(sta);
+
+ /*
+ * mac80211 should not be passing a partially
+ * initialised station!
+ */
+ WARN_ON(sta_id == IWL_INVALID_STATION);
+
+ return sta_id;
+}
#endif /* __iwl_sta_h__ */
diff --git a/drivers/net/wireless/iwlwifi/iwl3945-base.c b/drivers/net/wireless/iwlwifi/iwl3945-base.c
index 4c78783..68b8a1a 100644
--- a/drivers/net/wireless/iwlwifi/iwl3945-base.c
+++ b/drivers/net/wireless/iwlwifi/iwl3945-base.c
@@ -509,10 +509,7 @@
hdr_len = ieee80211_hdrlen(fc);
/* Find index into station table for destination station */
- if (!info->control.sta)
- sta_id = priv->hw_params.bcast_sta_id;
- else
- sta_id = iwl_sta_id(info->control.sta);
+ sta_id = iwl_sta_id_or_broadcast(priv, info->control.sta);
if (sta_id == IWL_INVALID_STATION) {
IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
hdr->addr1);
@@ -3336,17 +3333,9 @@
static_key = !iwl_is_associated(priv);
if (!static_key) {
- if (!sta) {
- sta_id = priv->hw_params.bcast_sta_id;
- } else {
- sta_id = iwl_sta_id(sta);
- if (sta_id == IWL_INVALID_STATION) {
- IWL_DEBUG_MAC80211(priv,
- "leave - %pM not in station map.\n",
- sta->addr);
- return -EINVAL;
- }
- }
+ sta_id = iwl_sta_id_or_broadcast(priv, sta);
+ if (sta_id == IWL_INVALID_STATION)
+ return -EINVAL;
}
mutex_lock(&priv->mutex);
