[PATCH 2/2] brcmfmac: support removing AP interfaces with "interface_remove"

[Rafał Miłecki]

New firmwares (e.g. 10.10.69.36 for BCM4366) support "interface_remove"
for removing interfaces. Try to use this method on cfg80211 request. In
case of older firmwares (e.g. 7.35.177.56 for BCM43602 as I tested) this
will just result in firmware rejecting command and this won't change any
behavior.

Signed-off-by: Rafał Miłecki <zaj...@gmail.com>
---
 .../broadcom/brcm80211/brcmfmac/cfg80211.c         | 39 +++++++++++++++++++++-
 1 file changed, 38 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c 
b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
index a5db953..6e6066a 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
@@ -785,12 +785,48 @@ s32 brcmf_notify_escan_complete(struct 
brcmf_cfg80211_info *cfg,
        return err;
 }
 
+static int brcmf_cfg80211_del_ap_iface(struct wiphy *wiphy,
+                                      struct wireless_dev *wdev)
+{
+       struct brcmf_cfg80211_info *cfg = wiphy_priv(wiphy);
+       struct net_device *ndev = wdev->netdev;
+       struct brcmf_if *ifp = netdev_priv(ndev);
+       int ret;
+       int err;
+
+       brcmf_cfg80211_arm_vif_event(cfg, ifp->vif);
+
+       err = brcmf_fil_bsscfg_data_set(ifp, "interface_remove", NULL, 0);
+       if (err) {
+               brcmf_err("interface_remove failed %d\n", err);
+               goto err_unarm;
+       }
+
+       /* wait for firmware event */
+       ret = brcmf_cfg80211_wait_vif_event(cfg, BRCMF_E_IF_DEL,
+                                           BRCMF_VIF_EVENT_TIMEOUT);
+       if (!ret) {
+               brcmf_err("timeout occurred\n");
+               err = -EIO;
+               goto err_unarm;
+       }
+
+       brcmf_remove_interface(ifp, true);
+
+err_unarm:
+       brcmf_cfg80211_arm_vif_event(cfg, NULL);
+       return err;
+}
+
 static
 int brcmf_cfg80211_del_iface(struct wiphy *wiphy, struct wireless_dev *wdev)
 {
        struct brcmf_cfg80211_info *cfg = wiphy_priv(wiphy);
        struct net_device *ndev = wdev->netdev;
 
+       if (ndev && ndev == cfg_to_ndev(cfg))
+               return -ENOTSUPP;
+
        /* vif event pending in firmware */
        if (brcmf_cfg80211_vif_event_armed(cfg))
                return -EBUSY;
@@ -807,12 +843,13 @@ int brcmf_cfg80211_del_iface(struct wiphy *wiphy, struct 
wireless_dev *wdev)
        switch (wdev->iftype) {
        case NL80211_IFTYPE_ADHOC:
        case NL80211_IFTYPE_STATION:
-       case NL80211_IFTYPE_AP:
        case NL80211_IFTYPE_AP_VLAN:
        case NL80211_IFTYPE_WDS:
        case NL80211_IFTYPE_MONITOR:
        case NL80211_IFTYPE_MESH_POINT:
                return -EOPNOTSUPP;
+       case NL80211_IFTYPE_AP:
+               return brcmf_cfg80211_del_ap_iface(wiphy, wdev);
        case NL80211_IFTYPE_P2P_CLIENT:
        case NL80211_IFTYPE_P2P_GO:
        case NL80211_IFTYPE_P2P_DEVICE:
-- 
1.8.4.5