brcmfmac: use custom destructor callback for all netdevice interfaces

The destructor for net devices was set to free_netdev() to get rid
of it and the private data. The private data refers to a brcmf_if
instance, but indirectly it also refers to brcmf_cfg80211_vif which
holds the wdev. This is freed as well by using a new custom destructor
called brcmf_cfg80211_free_netdev().

Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/brcm80211/brcmfmac/dhd_linux.c

@@ -702,7 +702,7 @@ int brcmf_net_attach(struct brcmf_if *ifp, bool rtnl_locked)
 
 	brcmf_dbg(INFO, "%s: Broadcom Dongle Host Driver\n", ndev->name);
 
-	ndev->destructor = free_netdev;
+	ndev->destructor = brcmf_cfg80211_free_netdev;
 	return 0;
 
 fail:

drivers/net/wireless/brcm80211/brcmfmac/p2p.c

@@ -2240,23 +2240,6 @@ static void brcmf_p2p_delete_p2pdev(struct brcmf_p2p_info *p2p,
 	brcmf_free_vif(vif);
 }
 
-/**
- * brcmf_p2p_free_p2p_if() - free up net device related data.
- *
- * @ndev: net device that needs to be freed.
- */
-static void brcmf_p2p_free_p2p_if(struct net_device *ndev)
-{
-	struct brcmf_cfg80211_vif *vif;
-	struct brcmf_if *ifp;
-
-	ifp = netdev_priv(ndev);
-	vif = ifp->vif;
-
-	brcmf_free_vif(vif);
-	free_netdev(ifp->ndev);
-}
-
 /**
  * brcmf_p2p_add_vif() - create a new P2P virtual interface.
  *
@@ -2334,8 +2317,6 @@ struct wireless_dev *brcmf_p2p_add_vif(struct wiphy *wiphy, const char *name,
 		brcmf_err("Registering netdevice failed\n");
 		goto fail;
 	}
-	/* override destructor */
-	ifp->ndev->destructor = brcmf_p2p_free_p2p_if;
 
 	cfg->p2p.bss_idx[P2PAPI_BSSCFG_CONNECTION].vif = vif;
 	/* Disable firmware roaming for P2P interface  */

drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c

@@ -4385,6 +4385,18 @@ void brcmf_free_vif(struct brcmf_cfg80211_vif *vif)
 	kfree(vif);
 }
 
+void brcmf_cfg80211_free_netdev(struct net_device *ndev)
+{
+	struct brcmf_cfg80211_vif *vif;
+	struct brcmf_if *ifp;
+
+	ifp = netdev_priv(ndev);
+	vif = ifp->vif;
+
+	brcmf_free_vif(vif);
+	free_netdev(ndev);
+}
+
 static bool brcmf_is_linkup(const struct brcmf_event_msg *e)
 {
 	u32 event = e->event_code;

drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.h

@@ -505,5 +505,6 @@ s32 brcmf_notify_escan_complete(struct brcmf_cfg80211_info *cfg,
 				bool fw_abort);
 void brcmf_set_mpc(struct brcmf_if *ndev, int mpc);
 void brcmf_abort_scanning(struct brcmf_cfg80211_info *cfg);
+void brcmf_cfg80211_free_netdev(struct net_device *ndev);
 
 #endif				/* _wl_cfg80211_h_ */