qcacld-3.0: Fix peer unmap failure due to invalid roam scan mode value

When supplicant disables firmware roam, RSO stop command with
roam scan mode value 4 is sent to firmware and this value 4
indicates the firmare to enable only Forced roam trigger(roam
invoke command from host). But before
ROAM_DEINIT(WMI_VDEV_PARAM_ROAM_FW_OFFLOAD with value zero) is
posted to firmware, the roam scan mode should be 0 or else there
could be potential peer unmap failures if firmware has already
started roam and disconnect is triggered from north bound or from
peer.

To avoid this, in the roam offload state machine handle the state
switch from RSO stopped to deinit if supplicant disabled roaming
flag is set and send RSO stop with roam scan mode value 0 to
firmware.

Change-Id: If50a306b6019320ddab2ac1695a57718d27f477a
CRs-Fixed: 2755948

core/sme/src/csr/csr_api_roam.c

@@ -18842,6 +18842,7 @@ csr_roam_switch_to_deinit(struct mac_context *mac, uint8_t vdev_id,
 			  uint8_t reason)
 {
 	QDF_STATUS status;
+	bool sup_disabled_roam;
 	struct wlan_objmgr_vdev *vdev;
 	struct mlme_roam_after_data_stall *vdev_roam_params;
 	enum roam_offload_state cur_state = mlme_get_roam_state(mac->psoc,
@@ -18867,6 +18868,28 @@ csr_roam_switch_to_deinit(struct mac_context *mac, uint8_t vdev_id,
 		csr_roam_switch_to_rso_stop(mac, vdev_id, reason);
 		break;
 	case WLAN_ROAM_RSO_STOPPED:
+		/*
+		 * When Supplicant disabled roaming is set and roam invoke
+		 * command is received from userspace, fw starts to roam.
+		 * But meanwhile if a disassoc/deauth is received from AP or if
+		 * NB disconnect is initiated while supplicant disabled roam,
+		 * RSO stop with ROAM scan mode as 0 is not sent to firmware
+		 * since the previous state was RSO_STOPPED. This could lead
+		 * to firmware not sending peer unmap event for the current
+		 * AP. To avoid this, if previous RSO stop was sent with
+		 * ROAM scan mode as 4, send RSO stop with Roam scan mode as 0
+		 * and then switch to ROAM_DEINIT.
+		 */
+		sup_disabled_roam =
+			mlme_get_supplicant_disabled_roaming(mac->psoc,
+							     vdev_id);
+		if (sup_disabled_roam) {
+			sme_debug("vdev[%d]: supplicant disabled roam. clear roam scan mode",
+				  vdev_id);
+			csr_post_rso_stop(mac, vdev_id, REASON_DISCONNECTED);
+		}
+		break;
+
 	case WLAN_ROAM_INIT:
 		break;