qcacld-3.0: Allocate scan filter memory from dynamic memory pool

csr_scan_get_result API defined 'struct scan_filter' of size
800bytes on stack and larger size memory blocks on stack is not
preferred because the stack size is limited.

Modified the memory allocation to dyanmic for scan filter.

Change-Id: I40cb0d97e0451d50aca3e9485327a4ce709e6020
CRs-Fixed: 2332496

core/sme/src/csr/csr_api_scan.c

@@ -2950,7 +2950,7 @@ QDF_STATUS csr_scan_get_result(tpAniSirGlobal mac_ctx,
 	QDF_STATUS status;
 	struct scan_result_list *ret_list = NULL;
 	qdf_list_t *list = NULL;
-	struct scan_filter filter = {0};
+	struct scan_filter *filter = NULL;
 	struct wlan_objmgr_pdev *pdev = NULL;
 
 	if (results)
@@ -2958,14 +2958,19 @@ QDF_STATUS csr_scan_get_result(tpAniSirGlobal mac_ctx,
 
 	pdev = wlan_objmgr_get_pdev_by_id(mac_ctx->psoc,
 		0, WLAN_LEGACY_MAC_ID);
-
 	if (!pdev) {
 		sme_err("pdev is NULL");
 		return QDF_STATUS_E_INVAL;
 	}
 
 	if (pFilter) {
-		status = csr_prepare_scan_filter(mac_ctx, pFilter, &filter);
+		filter = qdf_mem_malloc(sizeof(*filter));
+		if (!filter) {
+			status = QDF_STATUS_E_NOMEM;
+			goto error;
+		}
+
+		status = csr_prepare_scan_filter(mac_ctx, pFilter, filter);
 		if (QDF_IS_STATUS_ERROR(status)) {
 			sme_err("Prepare filter failed");
 			goto error;
@@ -2973,7 +2978,7 @@ QDF_STATUS csr_scan_get_result(tpAniSirGlobal mac_ctx,
 	}
 
 	list = ucfg_scan_get_result(pdev,
-		    pFilter ? &filter : NULL);
+		    pFilter ? filter : NULL);
 	if (list)
 		sme_debug("num_entries %d", qdf_list_size(list));
 
@@ -3012,6 +3017,8 @@ QDF_STATUS csr_scan_get_result(tpAniSirGlobal mac_ctx,
 	}
 
 error:
+	if (filter)
+		qdf_mem_free(filter);
 	if (list)
 		ucfg_scan_purge_results(list);
 	if (pdev)
@@ -3114,23 +3121,39 @@ QDF_STATUS csr_scan_flush_result(tpAniSirGlobal mac_ctx)
 QDF_STATUS csr_scan_flush_selective_result(tpAniSirGlobal mac_ctx,
 	bool flush_p2p)
 {
-	struct scan_filter filter = {0};
+	struct scan_filter *filter;
+	QDF_STATUS status;
 
-	filter.p2p_results = flush_p2p;
-	return csr_flush_scan_results(mac_ctx, &filter);
+	filter = qdf_mem_malloc(sizeof(*filter));
+	if (!filter) {
+		status = QDF_STATUS_E_NOMEM;
+		goto end;
+	}
+	filter->p2p_results = flush_p2p;
+	status = csr_flush_scan_results(mac_ctx, filter);
+	if (filter)
+		qdf_mem_free(filter);
+end:
+	return status;
 }
 
 static inline void csr_flush_bssid(tpAniSirGlobal mac_ctx,
 	uint8_t *bssid)
 {
-	struct scan_filter filter = {0};
+	struct scan_filter *filter;
+
+	filter = qdf_mem_malloc(sizeof(*filter));
+	if (!filter)
+		return;
 
-	filter.num_of_bssid = 1;
-	qdf_mem_copy(filter.bssid_list[0].bytes,
-		bssid, QDF_MAC_ADDR_SIZE);
+	filter->num_of_bssid = 1;
+	qdf_mem_copy(filter->bssid_list[0].bytes,
+		     bssid, QDF_MAC_ADDR_SIZE);
 
-	csr_flush_scan_results(mac_ctx, &filter);
+	csr_flush_scan_results(mac_ctx, filter);
 	sme_debug("Removed BSS entry:%pM", bssid);
+	if (filter)
+		qdf_mem_free(filter);
 }
 
 void csr_scan_flush_bss_entry(tpAniSirGlobal mac_ctx,