Some sockets set sock->sk->sk_allocation = GFP_ATOMIC. In spite of this,
functions that call sock_alloc_send_skb will then call
sock_alloc_send_pskb, which very often results in sleeping. Since the
intention of callers setting sk_allocation = GFP_ATOMIC might be to be
able to send from atomic context, we need to honor this and not sleep.
Signed-off-by: Jason A. Donenfeld <ja...@zx2c4.com>
---
net/core/sock.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/core/sock.c b/net/core/sock.c
index 1e1fe9a..f00e691 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1804,34 +1804,37 @@ struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
unsigned long header_len,
unsigned long data_len, int noblock,
int *errcode, int max_page_order)
{
struct sk_buff *skb;
long timeo;
int err;
timeo = sock_sndtimeo(sk, noblock);
for (;;) {
err = sock_error(sk);
if (err != 0)
goto failure;
err = -EPIPE;
if (sk->sk_shutdown & SEND_SHUTDOWN)
goto failure;
+ if (sk->sk_allocation & GFP_ATOMIC)
+ break;
+
if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf)
break;
set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
err = -EAGAIN;
if (!timeo)
goto failure;
if (signal_pending(current))
goto interrupted;
timeo = sock_wait_for_wmem(sk, timeo);
}
skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
errcode, sk->sk_allocation);
if (skb)
skb_set_owner_w(skb, sk);
return skb;
--
2.4.2
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