diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c
index 30a5a978a..669e7c519 100644
--- a/net/mac80211/debugfs_netdev.c
+++ b/net/mac80211/debugfs_netdev.c
@@ -656,7 +656,10 @@ static ssize_t ieee80211_if_fmt_tsf(
        struct ieee80211_local *local = sdata->local;
        u64 tsf;
 
-       tsf = drv_get_tsf(local, (struct ieee80211_sub_if_data *)sdata);
+       if (!(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
+               tsf = -1ULL;
+       else
+               tsf = drv_get_tsf(local, (struct ieee80211_sub_if_data