brcmfmac: simplify building interface combinations

Move similar/duplicated code out of combination specific code blocks.
This simplifies code a bit and allows adding more combinations later.
A list of combinations remains unchanged.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c

@@ -6547,12 +6547,13 @@ static int brcmf_setup_ifmodes(struct wiphy *wiphy, struct brcmf_if *ifp)
 	struct ieee80211_iface_limit *c0_limits = NULL;
 	struct ieee80211_iface_limit *p2p_limits = NULL;
 	struct ieee80211_iface_limit *mbss_limits = NULL;
-	bool mbss, p2p, rsdb;
+	bool mbss, p2p, rsdb, mchan;
 	int i, c, n_combos;
 
 	mbss = brcmf_feat_is_enabled(ifp, BRCMF_FEAT_MBSS);
 	p2p = brcmf_feat_is_enabled(ifp, BRCMF_FEAT_P2P);
 	rsdb = brcmf_feat_is_enabled(ifp, BRCMF_FEAT_RSDB);
+	mchan = brcmf_feat_is_enabled(ifp, BRCMF_FEAT_MCHAN);
 
 	n_combos = 1 + !!(p2p && !rsdb) + !!mbss;
 	combo = kcalloc(n_combos, sizeof(*combo), GFP_KERNEL);
@@ -6562,6 +6563,10 @@ static int brcmf_setup_ifmodes(struct wiphy *wiphy, struct brcmf_if *ifp)
 	wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
 				 BIT(NL80211_IFTYPE_ADHOC) |
 				 BIT(NL80211_IFTYPE_AP);
+	if (p2p)
+		wiphy->interface_modes |= BIT(NL80211_IFTYPE_P2P_CLIENT) |
+					  BIT(NL80211_IFTYPE_P2P_GO) |
+					  BIT(NL80211_IFTYPE_P2P_DEVICE);
 
 	c = 0;
 	i = 0;
@@ -6573,48 +6578,28 @@ static int brcmf_setup_ifmodes(struct wiphy *wiphy, struct brcmf_if *ifp)
 		c0_limits = kcalloc(2, sizeof(*c0_limits), GFP_KERNEL);
 	if (!c0_limits)
 		goto err;
-	if (p2p && rsdb) {
-		combo[c].num_different_channels = 2;
-		wiphy->interface_modes |= BIT(NL80211_IFTYPE_P2P_CLIENT) |
-					  BIT(NL80211_IFTYPE_P2P_GO) |
-					  BIT(NL80211_IFTYPE_P2P_DEVICE);
-		c0_limits[i].max = 2;
-		c0_limits[i++].types = BIT(NL80211_IFTYPE_STATION);
+
+	combo[c].num_different_channels = 1 + (rsdb || (p2p && mchan));
+	c0_limits[i].max = 1 + rsdb;
+	c0_limits[i++].types = BIT(NL80211_IFTYPE_STATION);
+	if (p2p) {
 		c0_limits[i].max = 1;
 		c0_limits[i++].types = BIT(NL80211_IFTYPE_P2P_DEVICE);
-		c0_limits[i].max = 2;
+		c0_limits[i].max = 1 + rsdb;
 		c0_limits[i++].types = BIT(NL80211_IFTYPE_P2P_CLIENT) |
 				       BIT(NL80211_IFTYPE_P2P_GO);
+	}
+	if (p2p && rsdb) {
 		c0_limits[i].max = 2;
 		c0_limits[i++].types = BIT(NL80211_IFTYPE_AP);
 		combo[c].max_interfaces = 5;
 	} else if (p2p) {
-		if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_MCHAN))
-			combo[c].num_different_channels = 2;
-		else
-			combo[c].num_different_channels = 1;
-		c0_limits[i].max = 1;
-		c0_limits[i++].types = BIT(NL80211_IFTYPE_STATION);
-		wiphy->interface_modes |= BIT(NL80211_IFTYPE_P2P_CLIENT) |
-					  BIT(NL80211_IFTYPE_P2P_GO) |
-					  BIT(NL80211_IFTYPE_P2P_DEVICE);
-		c0_limits[i].max = 1;
-		c0_limits[i++].types = BIT(NL80211_IFTYPE_P2P_DEVICE);
-		c0_limits[i].max = 1;
-		c0_limits[i++].types = BIT(NL80211_IFTYPE_P2P_CLIENT) |
-				       BIT(NL80211_IFTYPE_P2P_GO);
 		combo[c].max_interfaces = i;
 	} else if (rsdb) {
-		combo[c].num_different_channels = 2;
-		c0_limits[i].max = 2;
-		c0_limits[i++].types = BIT(NL80211_IFTYPE_STATION);
 		c0_limits[i].max = 2;
 		c0_limits[i++].types = BIT(NL80211_IFTYPE_AP);
 		combo[c].max_interfaces = 3;
 	} else {
-		combo[c].num_different_channels = 1;
-		c0_limits[i].max = 1;
-		c0_limits[i++].types = BIT(NL80211_IFTYPE_STATION);
 		c0_limits[i].max = 1;
 		c0_limits[i++].types = BIT(NL80211_IFTYPE_AP);
 		combo[c].max_interfaces = i;