iwlwifi: mvm: clean up invalid station handling

Using IWL_MVM_STATION_COUNT and IWL_INVALID_STATION together
isn't a good idea as they have different values. Always use
IWL_MVM_STATION_COUNT for an invalid station in MVM and move
the definition of the IWL_INVALID_STATION constant into the
DVM driver to avoid making such mistakes again. The one use
in the transport code can be hard-coded to -1 instead as the
station ID is passed as an integer there.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/iwlwifi/mvm/mac80211.c
index c0043fc..fe03160 100644
--- a/drivers/net/wireless/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/iwlwifi/mvm/mac80211.c
@@ -940,7 +940,7 @@
 		 */
 		break;
 	case STA_NOTIFY_AWAKE:
-		if (WARN_ON(mvmsta->sta_id == IWL_INVALID_STATION))
+		if (WARN_ON(mvmsta->sta_id == IWL_MVM_STATION_COUNT))
 			break;
 		iwl_mvm_sta_modify_ps_wake(mvm, sta);
 		break;
diff --git a/drivers/net/wireless/iwlwifi/mvm/sta.c b/drivers/net/wireless/iwlwifi/mvm/sta.c
index 4d872d6..0fd96e4 100644
--- a/drivers/net/wireless/iwlwifi/mvm/sta.c
+++ b/drivers/net/wireless/iwlwifi/mvm/sta.c
@@ -945,7 +945,7 @@
 	    mvmvif->ap_sta_id != IWL_MVM_STATION_COUNT)
 		return mvmvif->ap_sta_id;
 
-	return IWL_INVALID_STATION;
+	return IWL_MVM_STATION_COUNT;
 }
 
 static int iwl_mvm_send_sta_key(struct iwl_mvm *mvm,
@@ -1093,7 +1093,7 @@
 
 	/* Get the station id from the mvm local station table */
 	sta_id = iwl_mvm_get_key_sta_id(vif, sta);
-	if (sta_id == IWL_INVALID_STATION) {
+	if (sta_id == IWL_MVM_STATION_COUNT) {
 		IWL_ERR(mvm, "Failed to find station id\n");
 		return -EINVAL;
 	}
@@ -1188,7 +1188,7 @@
 		return -ENOENT;
 	}
 
-	if (sta_id == IWL_INVALID_STATION) {
+	if (sta_id == IWL_MVM_STATION_COUNT) {
 		IWL_DEBUG_WEP(mvm, "station non-existent, early return.\n");
 		return 0;
 	}
@@ -1254,7 +1254,7 @@
 	struct iwl_mvm_sta *mvm_sta;
 	u8 sta_id = iwl_mvm_get_key_sta_id(vif, sta);
 
-	if (WARN_ON_ONCE(sta_id == IWL_INVALID_STATION))
+	if (WARN_ON_ONCE(sta_id == IWL_MVM_STATION_COUNT))
 		return;
 
 	rcu_read_lock();
diff --git a/drivers/net/wireless/iwlwifi/mvm/tx.c b/drivers/net/wireless/iwlwifi/mvm/tx.c
index c7456af..3fed01e 100644
--- a/drivers/net/wireless/iwlwifi/mvm/tx.c
+++ b/drivers/net/wireless/iwlwifi/mvm/tx.c
@@ -365,7 +365,7 @@
 	if (WARN_ON_ONCE(!mvmsta))
 		return -1;
 
-	if (WARN_ON_ONCE(mvmsta->sta_id == IWL_INVALID_STATION))
+	if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_STATION_COUNT))
 		return -1;
 
 	dev_cmd = iwl_mvm_set_tx_params(mvm, skb, sta, mvmsta->sta_id);
diff --git a/drivers/net/wireless/iwlwifi/mvm/utils.c b/drivers/net/wireless/iwlwifi/mvm/utils.c
index e308ad9..0cc8d8c 100644
--- a/drivers/net/wireless/iwlwifi/mvm/utils.c
+++ b/drivers/net/wireless/iwlwifi/mvm/utils.c
@@ -462,7 +462,7 @@
 		.data = { lq, },
 	};
 
-	if (WARN_ON(lq->sta_id == IWL_INVALID_STATION))
+	if (WARN_ON(lq->sta_id == IWL_MVM_STATION_COUNT))
 		return -EINVAL;
 
 	if (WARN_ON(init && (cmd.flags & CMD_ASYNC)))