mwifiex: don't advertise IBSS features without FW support

[ Upstream commit 6f21ab30469d670de620f758330aca9f3433f693 ]

As it is, doing something like

  # iw phy phy0 interface add foobar type ibss

on a firmware that doesn't have ad-hoc support just yields failures of
HostCmd_CMD_SET_BSS_MODE, which happened to return a '-1' error code
(-EPERM? not really right...) and sometimes may even crash the firmware
along the way.

Let's parse the firmware capability flag while registering the wiphy, so
we don't allow attempting IBSS at all, and we get a proper -EOPNOTSUPP
from nl80211 instead.

Fixes: e267e71e ("mwifiex: Disable adhoc feature based on firmware capability")
Signed-off-by: NBrian Norris <briannorris@chromium.org>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>

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

@@ -4282,11 +4282,13 @@ int mwifiex_register_cfg80211(struct mwifiex_adapter *adapter)
 	wiphy->mgmt_stypes = mwifiex_mgmt_stypes;
 	wiphy->max_remain_on_channel_duration = 5000;
 	wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
-				 BIT(NL80211_IFTYPE_ADHOC) |
 				 BIT(NL80211_IFTYPE_P2P_CLIENT) |
 				 BIT(NL80211_IFTYPE_P2P_GO) |
 				 BIT(NL80211_IFTYPE_AP);
 
+	if (ISSUPP_ADHOC_ENABLED(adapter->fw_cap_info))
+		wiphy->interface_modes |= BIT(NL80211_IFTYPE_ADHOC);
+
 	wiphy->bands[NL80211_BAND_2GHZ] = &mwifiex_band_2ghz;
 	if (adapter->config_bands & BAND_A)
 		wiphy->bands[NL80211_BAND_5GHZ] = &mwifiex_band_5ghz;
@@ -4346,11 +4348,13 @@ int mwifiex_register_cfg80211(struct mwifiex_adapter *adapter)
 	wiphy->available_antennas_tx = BIT(adapter->number_of_antenna) - 1;
 	wiphy->available_antennas_rx = BIT(adapter->number_of_antenna) - 1;
 
-	wiphy->features |= NL80211_FEATURE_HT_IBSS |
-			   NL80211_FEATURE_INACTIVITY_TIMER |
+	wiphy->features |= NL80211_FEATURE_INACTIVITY_TIMER |
 			   NL80211_FEATURE_LOW_PRIORITY_SCAN |
 			   NL80211_FEATURE_NEED_OBSS_SCAN;
 
+	if (ISSUPP_ADHOC_ENABLED(adapter->fw_cap_info))
+		wiphy->features |= NL80211_FEATURE_HT_IBSS;
+
 	if (ISSUPP_RANDOM_MAC(adapter->fw_cap_info))
 		wiphy->features |= NL80211_FEATURE_SCAN_RANDOM_MAC_ADDR |
 				   NL80211_FEATURE_SCHED_SCAN_RANDOM_MAC_ADDR |