qcacmn: Reduce log level in qdf_nbuf_track_memory_manager_destroy

These logs were being printed in the kmesg durring every unload.
Questions about these logs wasted time and indicated the logs were
too prominent and confusing.

Only log nbuf tracking free list stats to the kernel log when
unexpected conditions occured.  Also distinguish between pre-filled
tracking nodes and nodes that were used to track nbufs.

Change-Id: I835ef2a04500dbab3229e6765fe7a168c05837fa
CRs-Fixed: 1072098

qdf/linux/src/qdf_nbuf.c

@@ -1220,6 +1220,9 @@ static void qdf_nbuf_track_prefill(void)
 		qdf_nbuf_track_free(head);
 		head = node;
 	}
+
+	/* prefilled buffers should not count as used */
+	qdf_net_buf_track_max_used = 0;
 }
 
 /**
@@ -1260,17 +1263,36 @@ static void qdf_nbuf_track_memory_manager_destroy(void)
 	spin_lock_irqsave(&qdf_net_buf_track_free_list_lock, irq_flag);
 	node = qdf_net_buf_track_free_list;
 
-	qdf_print("%s: %d residual freelist size\n",
-			  __func__, qdf_net_buf_track_free_list_count);
+	if (qdf_net_buf_track_max_used > FREEQ_POOLSIZE * 4)
+		qdf_print("%s: unexpectedly large max_used count %d",
+			  __func__, qdf_net_buf_track_max_used);
 
-	qdf_print("%s: %d max freelist size observed\n",
-			  __func__, qdf_net_buf_track_max_free);
+	if (qdf_net_buf_track_max_used < qdf_net_buf_track_max_allocated)
+		qdf_print("%s: %d unused trackers were allocated",
+			  __func__,
+			  qdf_net_buf_track_max_allocated -
+			  qdf_net_buf_track_max_used);
 
-	qdf_print("%s: %d max buffers used observed\n",
-			  __func__, qdf_net_buf_track_max_used);
+	if (qdf_net_buf_track_free_list_count > FREEQ_POOLSIZE &&
+	    qdf_net_buf_track_free_list_count > 3*qdf_net_buf_track_max_used/4)
+		qdf_print("%s: check freelist shrinking functionality",
+			  __func__);
 
-	qdf_print("%s: %d max buffers allocated observed\n",
-			  __func__, qdf_net_buf_track_max_used);
+	QDF_TRACE(QDF_MODULE_ID_QDF, QDF_TRACE_LEVEL_INFO,
+		  "%s: %d residual freelist size\n",
+		  __func__, qdf_net_buf_track_free_list_count);
+
+	QDF_TRACE(QDF_MODULE_ID_QDF, QDF_TRACE_LEVEL_INFO,
+		  "%s: %d max freelist size observed\n",
+		  __func__, qdf_net_buf_track_max_free);
+
+	QDF_TRACE(QDF_MODULE_ID_QDF, QDF_TRACE_LEVEL_INFO,
+		  "%s: %d max buffers used observed\n",
+		  __func__, qdf_net_buf_track_max_used);
+
+	QDF_TRACE(QDF_MODULE_ID_QDF, QDF_TRACE_LEVEL_INFO,
+		  "%s: %d max buffers allocated observed\n",
+		  __func__, qdf_net_buf_track_max_allocated);
 
 	while (node) {
 		tmp = node;