bpf_sk_storage_clone() is the only caller of bpf_map_inc_not_zero()
and is holding rcu_read_lock().
map_idr_lock does not add any protection, just remove the cost
for passive TCP flows.
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Kui-Feng Lee <kuifeng@xxxxxxxx>
Cc: Martin KaFai Lau <martin.lau@xxxxxxxxxx>
---
kernel/bpf/syscall.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index e1e42e918ba7f682223e9a78028bb0cc360c01ce..d68c8d61f7ceddb732a5646c00b8f0c71fdc2d71 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -1593,11 +1593,8 @@ struct bpf_map *__bpf_map_inc_not_zero(struct bpf_map *map, bool uref)
struct bpf_map *bpf_map_inc_not_zero(struct bpf_map *map)
{
- spin_lock_bh(&map_idr_lock);
- map = __bpf_map_inc_not_zero(map, false);
- spin_unlock_bh(&map_idr_lock);
-
- return map;
+ lockdep_assert(rcu_read_lock_held());
+ return __bpf_map_inc_not_zero(map, false);
}
EXPORT_SYMBOL_GPL(bpf_map_inc_not_zero);
--
2.48.1.711.g2feabab25a-goog
