qcacld-3.0: fix congestion overflow issue

1\ Since (rx_clear_count_delta - tx_frame_count_delta) * 100 maybe
overflow if rx_clear_count_delta and tx_frame_count_delta are uint32.
To resolve this issue, change uint32 to uint64.
2\ Since the previous data does not reset, then enable the congestion
feature again. It uses the old data and causes overflow.

Change-Id: I1c7d5f5be901e14424a70dd2931acb2175598199
CRs-Fixed: 2943725

core/hdd/src/wlan_hdd_medium_assess.c

@@ -250,6 +250,22 @@ static int get_congestion_report_len(void)
 	return data_len;
 }
 
+/**
+ * hdd_congestion_reset_data() - reset/invalid the previous data
+ * @vdev_id: vdev id
+ *
+ * Return: None
+ */
+static void hdd_congestion_reset_data(uint8_t pdev_id)
+{
+	struct hdd_medium_assess_info *mdata;
+	uint8_t i;
+
+	mdata = &medium_assess_info[pdev_id];
+	for (i = 0; i < MEDIUM_ASSESS_NUM; i++)
+		mdata->data[i].part1_valid = 0;
+}
+
 /**
  * hdd_congestion_notification_cb() - congestion notification callback function
  * @vdev_id: vdev id
@@ -347,7 +363,11 @@ static void hdd_congestion_notification_report(uint8_t vdev_id,
 
 void hdd_medium_assess_ssr_enable_flag(void)
 {
+	uint8_t i;
+
 	ssr_flag = 1;
+	for (i = 0; i < WLAN_UMAC_MAX_RP_PID; i++)
+		hdd_congestion_reset_data(i);
 }
 
 void hdd_medium_assess_stop_timer(uint8_t pdev_id, struct hdd_context *hdd_ctx)
@@ -363,6 +383,7 @@ void hdd_medium_assess_stop_timer(uint8_t pdev_id, struct hdd_context *hdd_ctx)
 	medium_assess_info[pdev_id].config.interval = 0;
 	medium_assess_info[pdev_id].index = 0;
 	medium_assess_info[pdev_id].count = 0;
+	hdd_congestion_reset_data(pdev_id);
 
 	for (i = 0; i < WLAN_UMAC_MAX_RP_PID; i++)
 		interval += medium_assess_info[i].config.interval;
@@ -445,6 +466,7 @@ static int hdd_medium_assess_congestion_report(struct hdd_context *hdd_ctx,
 		medium_assess_info[pdev_id].config.interval = interval;
 		medium_assess_info[pdev_id].index = 0;
 		medium_assess_info[pdev_id].count = 0;
+		hdd_congestion_reset_data(pdev_id);
 		hdd_debug("medium assess enable: pdev_id %d, vdev_id: %d",
 			  pdev_id, vdev_id);
 
@@ -565,6 +587,7 @@ hdd_congestion_notification_calculation(struct hdd_medium_assess_info *info)
 	uint32_t rx_clear_count_delta, tx_frame_count_delta;
 	uint32_t cycle_count_delta;
 	uint32_t congestion = 0;
+	uint64_t diff;
 
 	h_index = info->index - 1;
 	if (h_index < 0)
@@ -612,9 +635,10 @@ hdd_congestion_notification_calculation(struct hdd_medium_assess_info *info)
 		cycle_count_delta += h_data->cycle_count;
 	}
 
+	diff = (rx_clear_count_delta - tx_frame_count_delta) * 100;
 	if (cycle_count_delta)
-		congestion = (rx_clear_count_delta - tx_frame_count_delta)
-			     * 100 / cycle_count_delta;
+		congestion = qdf_do_div(diff, cycle_count_delta);
+
 	if (congestion > 100)
 		congestion = 100;