diff options
| author | Jason Wang <jasowang@redhat.com> | 2016-11-30 13:17:52 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-11-30 15:06:02 -0500 |
| commit | aa196eed3d80d4b003b04a270712b978a012a939 (patch) | |
| tree | 73db65b94d0c8607ba2088178b6f00fa51bcc920 | |
| parent | af1cc7a2b86ddb8668ac38097866bedd7b849a76 (diff) | |
| download | linux-aa196eed3d80d4b003b04a270712b978a012a939.tar.bz2 | |
macvtap: handle ubuf refcount correctly when meet errors
We trigger uarg->callback() immediately after we decide do datacopy
even if caller want to do zerocopy. This will cause the callback
(vhost_net_zerocopy_callback) decrease the refcount. But when we meet
an error afterwards, the error handling in vhost handle_tx() will try
to decrease it again. This is wrong and fix this by delay the
uarg->callback() until we're sure there's no errors.
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/macvtap.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c index bceca2875771..7869b0651576 100644 --- a/drivers/net/macvtap.c +++ b/drivers/net/macvtap.c @@ -742,13 +742,8 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m, if (zerocopy) err = zerocopy_sg_from_iter(skb, from); - else { + else err = skb_copy_datagram_from_iter(skb, 0, from, len); - if (!err && m && m->msg_control) { - struct ubuf_info *uarg = m->msg_control; - uarg->callback(uarg, false); - } - } if (err) goto err_kfree; @@ -779,7 +774,11 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m, skb_shinfo(skb)->destructor_arg = m->msg_control; skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; + } else if (m && m->msg_control) { + struct ubuf_info *uarg = m->msg_control; + uarg->callback(uarg, false); } + if (vlan) { skb->dev = vlan->dev; dev_queue_xmit(skb); |