mwifiex: Allow switching interface type from P2P_CLIENT to P2P_GO

It's possible to change virtual interface type between P2P_CLIENT and
P2P_GO, the card supports that just fine, and it happens for example
when using miracast with the miraclecast software.

So allow type changes between P2P_CLIENT and P2P_GO and simply call into
mwifiex_change_vif_to_p2p(), which handles this just fine. We have to
call mwifiex_cfg80211_deinit_p2p() before though to make sure the old
p2p mode is properly uninitialized.
Signed-off-by: Jonas Dreßler <verdre@v0yd.nl>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210914195909.36035-7-verdre@v0yd.nl

drivers/net/wireless/marvell/mwifiex/cfg80211.c

@@ -990,11 +990,26 @@ is_vif_type_change_allowed(struct mwifiex_adapter *adapter,
 		}
 
 	case NL80211_IFTYPE_P2P_CLIENT:
+		switch (new_iftype) {
+		case NL80211_IFTYPE_ADHOC:
+		case NL80211_IFTYPE_STATION:
+			return true;
+		case NL80211_IFTYPE_P2P_GO:
+			return true;
+		case NL80211_IFTYPE_AP:
+			return adapter->curr_iface_comb.uap_intf !=
+			       adapter->iface_limit.uap_intf;
+		default:
+			return false;
+		}
+
 	case NL80211_IFTYPE_P2P_GO:
 		switch (new_iftype) {
 		case NL80211_IFTYPE_ADHOC:
 		case NL80211_IFTYPE_STATION:
 			return true;
+		case NL80211_IFTYPE_P2P_CLIENT:
+			return true;
 		case NL80211_IFTYPE_AP:
 			return adapter->curr_iface_comb.uap_intf !=
 			       adapter->iface_limit.uap_intf;
@@ -1265,6 +1280,24 @@ mwifiex_cfg80211_change_virtual_intf(struct wiphy *wiphy,
 		}
 
 	case NL80211_IFTYPE_P2P_CLIENT:
+		if (mwifiex_cfg80211_deinit_p2p(priv))
+			return -EFAULT;
+
+		switch (type) {
+		case NL80211_IFTYPE_ADHOC:
+		case NL80211_IFTYPE_STATION:
+			return mwifiex_change_vif_to_sta_adhoc(dev, curr_iftype,
+							       type, params);
+		case NL80211_IFTYPE_P2P_GO:
+			return mwifiex_change_vif_to_p2p(dev, curr_iftype,
+							 type, params);
+		case NL80211_IFTYPE_AP:
+			return mwifiex_change_vif_to_ap(dev, curr_iftype, type,
+							params);
+		default:
+			goto errnotsupp;
+		}
+
 	case NL80211_IFTYPE_P2P_GO:
 		if (mwifiex_cfg80211_deinit_p2p(priv))
 			return -EFAULT;
@@ -1274,6 +1307,9 @@ mwifiex_cfg80211_change_virtual_intf(struct wiphy *wiphy,
 		case NL80211_IFTYPE_STATION:
 			return mwifiex_change_vif_to_sta_adhoc(dev, curr_iftype,
 							       type, params);
+		case NL80211_IFTYPE_P2P_CLIENT:
+			return mwifiex_change_vif_to_p2p(dev, curr_iftype,
+							 type, params);
 		case NL80211_IFTYPE_AP:
 			return mwifiex_change_vif_to_ap(dev, curr_iftype, type,
 							params);