mac80211: remove STA infos last_ack stuff

These things aren't used and the only possible use is within
rate control algorithms, however those can, if they need it,
keep track of it in their private data. last_ack_ms isn't
even updated so completely useless.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/debugfs_sta.c

@@ -98,31 +98,6 @@ static ssize_t sta_num_ps_buf_frames_read(struct file *file,
 }
 STA_OPS(num_ps_buf_frames);
 
-static ssize_t sta_last_ack_rssi_read(struct file *file, char __user *userbuf,
-				      size_t count, loff_t *ppos)
-{
-	char buf[100];
-	struct sta_info *sta = file->private_data;
-	int res = scnprintf(buf, sizeof(buf), "%d %d %d\n",
-			    sta->last_ack_rssi[0],
-			    sta->last_ack_rssi[1],
-			    sta->last_ack_rssi[2]);
-	return simple_read_from_buffer(userbuf, count, ppos, buf, res);
-}
-STA_OPS(last_ack_rssi);
-
-static ssize_t sta_last_ack_ms_read(struct file *file, char __user *userbuf,
-				    size_t count, loff_t *ppos)
-{
-	char buf[20];
-	struct sta_info *sta = file->private_data;
-	int res = scnprintf(buf, sizeof(buf), "%d\n",
-			    sta->last_ack ?
-			    jiffies_to_msecs(jiffies - sta->last_ack) : -1);
-	return simple_read_from_buffer(userbuf, count, ppos, buf, res);
-}
-STA_OPS(last_ack_ms);
-
 static ssize_t sta_inactive_ms_read(struct file *file, char __user *userbuf,
 				    size_t count, loff_t *ppos)
 {
@@ -311,8 +286,6 @@ void ieee80211_sta_debugfs_add(struct sta_info *sta)
 
 	DEBUGFS_ADD(flags);
 	DEBUGFS_ADD(num_ps_buf_frames);
-	DEBUGFS_ADD(last_ack_rssi);
-	DEBUGFS_ADD(last_ack_ms);
 	DEBUGFS_ADD(inactive_ms);
 	DEBUGFS_ADD(last_seq_ctrl);
 #ifdef CONFIG_MAC80211_DEBUG_COUNTERS
@@ -326,8 +299,6 @@ void ieee80211_sta_debugfs_remove(struct sta_info *sta)
 {
 	DEBUGFS_DEL(flags);
 	DEBUGFS_DEL(num_ps_buf_frames);
-	DEBUGFS_DEL(last_ack_rssi);
-	DEBUGFS_DEL(last_ack_ms);
 	DEBUGFS_DEL(inactive_ms);
 	DEBUGFS_DEL(last_seq_ctrl);
 #ifdef CONFIG_MAC80211_DEBUG_COUNTERS

net/mac80211/rc80211_pid_algo.c

@@ -280,9 +280,6 @@ static void rate_control_pid_tx_status(void *priv, struct net_device *dev,
 		sta->tx_num_consecutive_failures++;
 		sta->tx_num_mpdu_fail++;
 	} else {
-		sta->last_ack_rssi[0] = sta->last_ack_rssi[1];
-		sta->last_ack_rssi[1] = sta->last_ack_rssi[2];
-		sta->last_ack_rssi[2] = status->ack_signal;
 		sta->tx_num_consecutive_failures = 0;
 		sta->tx_num_mpdu_ok++;
 	}

net/mac80211/rc80211_simple.c

@@ -131,9 +131,6 @@ static void rate_control_simple_tx_status(void *priv, struct net_device *dev,
 		sta->tx_num_consecutive_failures++;
 		sta->tx_num_mpdu_fail++;
 	} else {
-		sta->last_ack_rssi[0] = sta->last_ack_rssi[1];
-		sta->last_ack_rssi[1] = sta->last_ack_rssi[2];
-		sta->last_ack_rssi[2] = status->ack_signal;
 		sta->tx_num_consecutive_failures = 0;
 		sta->tx_num_mpdu_ok++;
 	}

net/mac80211/sta_info.h

@@ -177,8 +177,6 @@ struct sta_info {
 	int last_rssi; /* RSSI of last received frame from this STA */
 	int last_signal; /* signal of last received frame from this STA */
 	int last_noise; /* noise of last received frame from this STA */
-	int last_ack_rssi[3]; /* RSSI of last received ACKs from this STA */
-	unsigned long last_ack;
 	int channel_use;
 	int channel_use_raw;
 
@@ -200,8 +198,6 @@ struct sta_info {
 		struct dentry *dir;
 		struct dentry *flags;
 		struct dentry *num_ps_buf_frames;
-		struct dentry *last_ack_rssi;
-		struct dentry *last_ack_ms;
 		struct dentry *inactive_ms;
 		struct dentry *last_seq_ctrl;
 #ifdef CONFIG_MAC80211_DEBUG_COUNTERS