ath11k: fix WARN_ON during ath11k_mac_update_vif_chan

Fix WARN_ON() from ath11k_mac_update_vif_chan() if vdev is not up.
Since change_chanctx can be called even before vdev_up from
ieee80211_start_ap->ieee80211_vif_use_channel->
ieee80211_recalc_radar_chanctx.

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

Tested-on: QCN9074 hw1.0 PCI WLAN.HK.2.5.0.1-01100-QCAHKSWPL_SILICONZ-1
Signed-off-by: Venkateswara Naralasetty <quic_vnaralas@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/1644416019-820-1-git-send-email-quic_vnaralas@quicinc.com

drivers/net/wireless/ath/ath11k/mac.c

@@ -6856,15 +6856,35 @@ ath11k_mac_update_vif_chan(struct ath11k *ar,
 		if (WARN_ON(!arvif->is_started))
 			continue;
 
-		if (WARN_ON(!arvif->is_up))
-			continue;
-
+		/* change_chanctx can be called even before vdev_up from
+		 * ieee80211_start_ap->ieee80211_vif_use_channel->
+		 * ieee80211_recalc_radar_chanctx.
+		 *
+		 * 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 = ath11k_mac_vdev_restart(arvif, &vifs[i].new_ctx->def);
 			if (ret) {
 				ath11k_warn(ab, "failed to restart vdev %d: %d\n",
 					    arvif->vdev_id, ret);
 				continue;
 			}
+		} else {
+			ret = ath11k_mac_vdev_stop(arvif);
+			if (ret) {
+				ath11k_warn(ab, "failed to stop vdev %d: %d\n",
+					    arvif->vdev_id, ret);
+				continue;
+			}
+
+			ret = ath11k_mac_vdev_start(arvif, &vifs[i].new_ctx->def);
+			if (ret)
+				ath11k_warn(ab, "failed to start vdev %d: %d\n",
+					    arvif->vdev_id, ret);
+
+			continue;
+		}
 
 		ret = ath11k_mac_setup_bcn_tmpl(arvif);
 		if (ret)