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| author | Eric Dumazet <edumazet@google.com> | 2023-08-31 16:52:09 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-09-01 09:27:33 +0300 |
| commit | 5e6300e7b3a4ab5b72a82079753868e91fbf9efc (patch) | |
| tree | c0376ce7b3667e6187785217db48aec2fd17d29a /net/ipv4/udp.c | |
| parent | 66d58f046c9d3a8f996b7138d02e965fd0617de0 (diff) | |
| download | linux-5e6300e7b3a4ab5b72a82079753868e91fbf9efc.tar.xz | |
net: annotate data-races around sk->sk_forward_alloc
Every time sk->sk_forward_alloc is read locklessly,
add a READ_ONCE().
Add sk_forward_alloc_add() helper to centralize updates,
to reduce number of WRITE_ONCE().
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/udp.c')
| -rw-r--r-- | net/ipv4/udp.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 0794a2c46a56..f39b9c844580 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -1414,9 +1414,9 @@ static void udp_rmem_release(struct sock *sk, int size, int partial, spin_lock(&sk_queue->lock); - sk->sk_forward_alloc += size; + sk_forward_alloc_add(sk, size); amt = (sk->sk_forward_alloc - partial) & ~(PAGE_SIZE - 1); - sk->sk_forward_alloc -= amt; + sk_forward_alloc_add(sk, -amt); if (amt) __sk_mem_reduce_allocated(sk, amt >> PAGE_SHIFT); @@ -1527,7 +1527,7 @@ int __udp_enqueue_schedule_skb(struct sock *sk, struct sk_buff *skb) goto uncharge_drop; } - sk->sk_forward_alloc -= size; + sk_forward_alloc_add(sk, -size); /* no need to setup a destructor, we will explicitly release the * forward allocated memory on dequeue |