mac80211: move sdata debugfs dir to vif

There is need create driver own per interface debugfs files. This is
currently done by drv_{add,remove}_interface_debugfs() callbacks. But it
is possible that after we remove interface from the driver (i.e.
on suspend) we call drv_remove_interface_debugfs() function. Fixing this
problem will require to add call drv_{add,remove}_interface_debugfs()
anytime we create and remove interface in mac80211. So it's better to
add debugfs dir dentry to vif structure to allow to create/remove
custom debugfs driver files on drv_{add,remove}_interface().

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/debugfs_key.c b/net/mac80211/debugfs_key.c
index c3a3082..1521cab 100644
--- a/net/mac80211/debugfs_key.c
+++ b/net/mac80211/debugfs_key.c
@@ -295,7 +295,7 @@
 	char buf[50];
 	struct ieee80211_key *key;
 
-	if (!sdata->debugfs.dir)
+	if (!sdata->vif.debugfs_dir)
 		return;
 
 	lockdep_assert_held(&sdata->local->key_mtx);
@@ -311,7 +311,7 @@
 		sprintf(buf, "../keys/%d", key->debugfs.cnt);
 		sdata->debugfs.default_unicast_key =
 			debugfs_create_symlink("default_unicast_key",
-					       sdata->debugfs.dir, buf);
+					       sdata->vif.debugfs_dir, buf);
 	}
 
 	if (sdata->debugfs.default_multicast_key) {
@@ -325,7 +325,7 @@
 		sprintf(buf, "../keys/%d", key->debugfs.cnt);
 		sdata->debugfs.default_multicast_key =
 			debugfs_create_symlink("default_multicast_key",
-					       sdata->debugfs.dir, buf);
+					       sdata->vif.debugfs_dir, buf);
 	}
 }
 
@@ -334,7 +334,7 @@
 	char buf[50];
 	struct ieee80211_key *key;
 
-	if (!sdata->debugfs.dir)
+	if (!sdata->vif.debugfs_dir)
 		return;
 
 	key = key_mtx_dereference(sdata->local,
@@ -343,7 +343,7 @@
 		sprintf(buf, "../keys/%d", key->debugfs.cnt);
 		sdata->debugfs.default_mgmt_key =
 			debugfs_create_symlink("default_mgmt_key",
-					       sdata->debugfs.dir, buf);
+					       sdata->vif.debugfs_dir, buf);
 	} else
 		ieee80211_debugfs_key_remove_mgmt_default(sdata);
 }