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[03/20] batman-adv: Place kref_get for tt_orig_list_entry near use

Message ID 20160822135620.15337-4-sw@simonwunderlich.de
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Simon Wunderlich Aug. 22, 2016, 1:56 p.m. UTC 
From: Sven Eckelmann <sven@narfation.org>

It is hard to understand why the refcnt is increased when it isn't done
near the actual place the new reference is used. So using kref_get right
before the place which requires the reference and in the same function
helps to avoid accidental problems caused by incorrect reference counting.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
---
 net/batman-adv/translation-table.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 2080407..5cc500f 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -1567,9 +1567,9 @@  batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
 	orig_entry->orig_node = orig_node;
 	orig_entry->ttvn = ttvn;
 	kref_init(&orig_entry->refcount);
-	kref_get(&orig_entry->refcount);
 
 	spin_lock_bh(&tt_global->list_lock);
+	kref_get(&orig_entry->refcount);
 	hlist_add_head_rcu(&orig_entry->list,
 			   &tt_global->orig_list);
 	spin_unlock_bh(&tt_global->list_lock);