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authorJason Wang <jasowang@redhat.com>2012-05-02 07:42:06 +0400
committerMichael S. Tsirkin <mst@redhat.com>2012-05-02 19:22:20 +0400
commit01d6657b388438def19c8baaea28e742b6ed32ec (patch)
tree7979049df013d023baa9f1a9ae7aa85e350e937c /drivers/net/macvtap.c
parent02ce04bb3d28c3333231f43bca677228dbc686fe (diff)
downloadlinux-01d6657b388438def19c8baaea28e742b6ed32ec.tar.xz
macvtap: zerocopy: set SKBTX_DEV_ZEROCOPY only when skb is built successfully
Current the SKBTX_DEV_ZEROCOPY is set unconditionally after zerocopy_sg_from_iovec(), this would lead NULL pointer when macvtap fails to build zerocopy skb because destructor_arg was not initialized. Solve this by set this flag after the skb were built successfully. Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/net/macvtap.c')
-rw-r--r--drivers/net/macvtap.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index 9ab182a40648..a4ff694cea22 100644
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -699,10 +699,9 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m,
if (!skb)
goto err;
- if (zerocopy) {
+ if (zerocopy)
err = zerocopy_sg_from_iovec(skb, iv, vnet_hdr_len, count);
- skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY;
- } else
+ else
err = skb_copy_datagram_from_iovec(skb, 0, iv, vnet_hdr_len,
len);
if (err)
@@ -721,8 +720,10 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m,
rcu_read_lock_bh();
vlan = rcu_dereference_bh(q->vlan);
/* copy skb_ubuf_info for callback when skb has no error */
- if (zerocopy)
+ if (zerocopy) {
skb_shinfo(skb)->destructor_arg = m->msg_control;
+ skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY;
+ }
if (vlan)
macvlan_start_xmit(skb, vlan->dev);
else