brcmfmac: avoid firmware commands when bus is down

Upon rmmod a few attempts are made to inform firmware, but there is
no point as the bus is down and these will fail. Avoid them to keep
the logs clean.
Reported-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Hante Meuleman <hante.meuleman@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>
Reviewed-by: Franky Lin <franky.lin@broadcom.com>
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

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

@@ -1286,17 +1286,21 @@ static void brcmf_link_down(struct brcmf_cfg80211_vif *vif, u16 reason)
 {
 	struct brcmf_cfg80211_info *cfg = wiphy_to_cfg(vif->wdev.wiphy);
 	struct brcmf_pub *drvr = cfg->pub;
+	bool bus_up = drvr->bus_if->state == BRCMF_BUS_UP;
 	s32 err = 0;
 
 	brcmf_dbg(TRACE, "Enter\n");
 
 	if (test_and_clear_bit(BRCMF_VIF_STATUS_CONNECTED, &vif->sme_state)) {
+		if (bus_up) {
 			brcmf_dbg(INFO, "Call WLC_DISASSOC to stop excess roaming\n");
 			err = brcmf_fil_cmd_data_set(vif->ifp,
 						     BRCMF_C_DISASSOC, NULL, 0);
-		if (err) {
-			bphy_err(drvr, "WLC_DISASSOC failed (%d)\n", err);
+			if (err)
+				bphy_err(drvr, "WLC_DISASSOC failed (%d)\n",
+					 err);
 		}
+
 		if ((vif->wdev.iftype == NL80211_IFTYPE_STATION) ||
 		    (vif->wdev.iftype == NL80211_IFTYPE_P2P_CLIENT))
 			cfg80211_disconnected(vif->wdev.netdev, reason, NULL, 0,
@@ -1306,6 +1310,7 @@ static void brcmf_link_down(struct brcmf_cfg80211_vif *vif, u16 reason)
 	clear_bit(BRCMF_SCAN_STATUS_SUPPRESS, &cfg->scan_status);
 	brcmf_btcoex_set_mode(vif, BRCMF_BTCOEX_ENABLED, 0);
 	if (vif->profile.use_fwsup != BRCMF_PROFILE_FWSUP_NONE) {
+		if (bus_up)
 			brcmf_set_pmk(vif->ifp, NULL, 0);
 		vif->profile.use_fwsup = BRCMF_PROFILE_FWSUP_NONE;
 	}
@@ -5004,18 +5009,16 @@ static int brcmf_cfg80211_get_channel(struct wiphy *wiphy,
 	struct brcmf_cfg80211_info *cfg = wiphy_to_cfg(wiphy);
 	struct net_device *ndev = wdev->netdev;
 	struct brcmf_pub *drvr = cfg->pub;
-	struct brcmf_if *ifp;
 	struct brcmu_chan ch;
 	enum nl80211_band band = 0;
 	enum nl80211_chan_width width = 0;
 	u32 chanspec;
 	int freq, err;
 
-	if (!ndev)
+	if (!ndev || drvr->bus_if->state != BRCMF_BUS_UP)
 		return -ENODEV;
-	ifp = netdev_priv(ndev);
 
-	err = brcmf_fil_iovar_int_get(ifp, "chanspec", &chanspec);
+	err = brcmf_fil_iovar_int_get(netdev_priv(ndev), "chanspec", &chanspec);
 	if (err) {
 		bphy_err(drvr, "chanspec failed (%d)\n", err);
 		return err;