wifi: ath12k: fix WARN_ON during ath12k_mac_update_vif_chan

Fix WARN_ON() from ath12k_mac_update_vif_chan() if vdev is not up.
Since change_chanctx can be called even before vdev_up.

Do vdev stop followed by a vdev start in case of vdev is down.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0-02903-QCAHKSWPL_SILICONZ-1
Signed-off-by: Manish Dharanenthiran <quic_mdharane@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20230802085852.19821-2-quic_mdharane@quicinc.com

drivers/net/wireless/ath/ath12k/mac.c

@@ -6039,15 +6039,30 @@ ath12k_mac_update_vif_chan(struct ath12k *ar,
 		if (WARN_ON(!arvif->is_started))
 			continue;
 
-		if (WARN_ON(!arvif->is_up))
-			continue;
-
+		/* Firmware expect vdev_restart only if vdev is up.
+		 * If vdev is down then it expect vdev_stop->vdev_start.
+		 */
+		if (arvif->is_up) {
 			ret = ath12k_mac_vdev_restart(arvif, &vifs[i].new_ctx->def);
 			if (ret) {
 				ath12k_warn(ab, "failed to restart vdev %d: %d\n",
 					    arvif->vdev_id, ret);
 				continue;
 			}
+		} else {
+			ret = ath12k_mac_vdev_stop(arvif);
+			if (ret) {
+				ath12k_warn(ab, "failed to stop vdev %d: %d\n",
+					    arvif->vdev_id, ret);
+				continue;
+			}
+
+			ret = ath12k_mac_vdev_start(arvif, &vifs[i].new_ctx->def);
+			if (ret)
+				ath12k_warn(ab, "failed to start vdev %d: %d\n",
+					    arvif->vdev_id, ret);
+			continue;
+		}
 
 		ret = ath12k_mac_setup_bcn_tmpl(arvif);
 		if (ret)