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tun: fix premature POLLOUT notification on tun devices

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am: beaa66cce5

Change-Id: Icbdc858f3a86d09f5c328480e057d9fdc33b1a3d
This commit is contained in:
Hannes Frederic Sowa
2017-03-22 12:01:01 +00:00
committed by android-build-merger
parent ee059e366e beaa66cce5
commit 912e06c79e
1 changed files with 15 additions and 3 deletions
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18
drivers/net/tun.c
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@@ -819,7 +819,18 @@ static void tun_net_uninit(struct net_device *dev)
/* Net device open. */
static int tun_net_open(struct net_device *dev)
{
struct tun_struct *tun = netdev_priv(dev);
int i;
netif_tx_start_all_queues(dev);
for (i = 0; i < tun->numqueues; i++) {
struct tun_file *tfile;
tfile = rtnl_dereference(tun->tfiles[i]);
tfile->socket.sk->sk_write_space(tfile->socket.sk);
}
return 0;
}
@@ -1116,9 +1127,10 @@ static unsigned int tun_chr_poll(struct file *file, poll_table *wait)
if (!skb_array_empty(&tfile->tx_array))
mask |= POLLIN | POLLRDNORM;
if (sock_writeable(sk) ||
(!test_and_set_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags) &&
sock_writeable(sk)))
if (tun->dev->flags & IFF_UP &&
(sock_writeable(sk) ||
(!test_and_set_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags) &&
sock_writeable(sk))))
mask |= POLLOUT | POLLWRNORM;
if (tun->dev->reg_state != NETREG_REGISTERED)