qcacmn: revert FISA LRU deletion change

Revert FISA LRU deletion change.

Change-Id: Ie24df0df8f3833c0a982036b71479f1eb8f485f8
CRs-Fixed: 3083882

hal/wifi3.0/qca6490/hal_6490.c

@@ -1533,6 +1533,7 @@ hal_rx_flow_setup_fse_6490(uint8_t *rx_fst, uint32_t table_offset,
 	struct hal_rx_fst *fst = (struct hal_rx_fst *)rx_fst;
 	struct hal_rx_flow *flow = (struct hal_rx_flow *)rx_flow;
 	uint8_t *fse;
+	bool fse_valid;
 
 	if (table_offset >= fst->max_entries) {
 		QDF_TRACE(QDF_MODULE_ID_TXRX, QDF_TRACE_LEVEL_ERROR,
@@ -1544,8 +1545,14 @@ hal_rx_flow_setup_fse_6490(uint8_t *rx_fst, uint32_t table_offset,
 	fse = (uint8_t *)fst->base_vaddr +
 		(table_offset * HAL_RX_FST_ENTRY_SIZE);
 
-	/* clear the valid bit before starting the deletion*/
-	HAL_CLR_FLD(fse, RX_FLOW_SEARCH_ENTRY_9, VALID);
+	fse_valid = HAL_GET_FLD(fse, RX_FLOW_SEARCH_ENTRY_9, VALID);
+
+	if (fse_valid) {
+		QDF_TRACE(QDF_MODULE_ID_TXRX, QDF_TRACE_LEVEL_DEBUG,
+				"HAL FSE %pK already valid", fse);
+		return NULL;
+	}
+
 	HAL_SET_FLD(fse, RX_FLOW_SEARCH_ENTRY_0, SRC_IP_127_96) =
 		HAL_SET_FLD_SM(RX_FLOW_SEARCH_ENTRY_0, SRC_IP_127_96,
 			(flow->tuple_info.src_ip_127_96));