iwlwifi: remove extra statistics request from debugfs

When reading current ucode statistics information from debugfs, in
current implementation, it will always send a new "statistics request" to
uCode. In normal operation, uCode should report the statistics per beacon
interval. Remove this extra request to reduce the additional command exchanges
between driver and uCode.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-debugfs.c

@@ -1109,16 +1109,6 @@ static ssize_t iwl_dbgfs_ucode_rx_stats_read(struct file *file,
 	if (!iwl_is_alive(priv))
 		return -EAGAIN;
 
-	/* make request to uCode to retrieve statistics information */
-	mutex_lock(&priv->mutex);
-	ret = iwl_send_statistics_request(priv, CMD_SYNC, false);
-	mutex_unlock(&priv->mutex);
-
-	if (ret) {
-		IWL_ERR(priv,
-			"Error sending statistics request: %zd\n", ret);
-		return -EAGAIN;
-	}
 	buf = kzalloc(bufsz, GFP_KERNEL);
 	if (!buf) {
 		IWL_ERR(priv, "Can not allocate Buffer\n");
@@ -1552,16 +1542,6 @@ static ssize_t iwl_dbgfs_ucode_tx_stats_read(struct file *file,
 	if (!iwl_is_alive(priv))
 		return -EAGAIN;
 
-	/* make request to uCode to retrieve statistics information */
-	mutex_lock(&priv->mutex);
-	ret = iwl_send_statistics_request(priv, CMD_SYNC, false);
-	mutex_unlock(&priv->mutex);
-
-	if (ret) {
-		IWL_ERR(priv,
-			"Error sending statistics request: %zd\n", ret);
-		return -EAGAIN;
-	}
 	buf = kzalloc(bufsz, GFP_KERNEL);
 	if (!buf) {
 		IWL_ERR(priv, "Can not allocate Buffer\n");
@@ -1739,16 +1719,6 @@ static ssize_t iwl_dbgfs_ucode_general_stats_read(struct file *file,
 	if (!iwl_is_alive(priv))
 		return -EAGAIN;
 
-	/* make request to uCode to retrieve statistics information */
-	mutex_lock(&priv->mutex);
-	ret = iwl_send_statistics_request(priv, CMD_SYNC, false);
-	mutex_unlock(&priv->mutex);
-
-	if (ret) {
-		IWL_ERR(priv,
-			"Error sending statistics request: %zd\n", ret);
-		return -EAGAIN;
-	}
 	buf = kzalloc(bufsz, GFP_KERNEL);
 	if (!buf) {
 		IWL_ERR(priv, "Can not allocate Buffer\n");
@@ -1986,23 +1956,12 @@ static ssize_t iwl_dbgfs_tx_power_read(struct file *file,
 	struct iwl_priv *priv = file->private_data;
 	char buf[128];
 	int pos = 0;
-	ssize_t ret;
 	const size_t bufsz = sizeof(buf);
 	struct statistics_tx *tx;
 
 	if (!iwl_is_alive(priv))
 		pos += scnprintf(buf + pos, bufsz - pos, "N/A\n");
 	else {
-		/* make request to uCode to retrieve statistics information */
-		mutex_lock(&priv->mutex);
-		ret = iwl_send_statistics_request(priv, CMD_SYNC, false);
-		mutex_unlock(&priv->mutex);
-
-		if (ret) {
-			IWL_ERR(priv, "Error sending statistics request: %zd\n",
-				ret);
-			return -EAGAIN;
-		}
 		tx = &priv->statistics.tx;
 		if (tx->tx_power.ant_a ||
 		    tx->tx_power.ant_b ||