3 files changed, 7 insertions, 26 deletions

diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h
index e55c8f4f55ef..41071d32bc8e 100644
--- a/drivers/net/hyperv/hyperv_net.h
+++ b/drivers/net/hyperv/hyperv_net.h
@@ -128,7 +128,6 @@ struct ndis_tcp_ip_checksum_info;
 struct hv_netvsc_packet {
         /* Bookkeeping stuff */
         u32 status;
-        bool part_of_skb;
 
         bool is_data_pkt;
         bool xmit_more; /* from skb */
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index c651d4d8b747..2d9ef533cc48 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -889,11 +889,6 @@ int netvsc_send(struct hv_device *device,
                 } else {
                         packet->page_buf_cnt = 0;
                         packet->total_data_buflen += msd_len;
-                        if (!packet->part_of_skb) {
-                                skb = (struct sk_buff *)(unsigned long)packet->
-                                       send_completion_tid;
-                                packet->send_completion_tid = 0;
-                        }
                 }
 
                 if (msdp->pkt)
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 66c4b0c8d108..5993c7e2d723 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -238,9 +238,6 @@ void netvsc_xmit_completion(void *context)
         struct sk_buff *skb = (struct sk_buff *)
                 (unsigned long)packet->send_completion_tid;
 
-        if (!packet->part_of_skb)
-                kfree(packet);
-
         if (skb)
                 dev_kfree_skb_any(skb);
 }
@@ -392,7 +389,6 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
         u32 net_trans_info;
         u32 hash;
         u32 skb_length;
-        u32 head_room;
         u32 pkt_sz;
         struct hv_page_buffer page_buf[MAX_PAGE_BUFFER_COUNT];
 
@@ -405,7 +401,6 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
 
 check_size:
         skb_length = skb->len;
-        head_room = skb_headroom(skb);
         num_data_pgs = netvsc_get_slots(skb) + 2;
         if (num_data_pgs > MAX_PAGE_BUFFER_COUNT && linear) {
                 net_alert_ratelimited("packet too big: %u pages (%u bytes)\n",
@@ -424,20 +419,14 @@ check_size:
 
         pkt_sz = sizeof(struct hv_netvsc_packet) + RNDIS_AND_PPI_SIZE;
 
-        if (head_room < pkt_sz) {
-                packet = kmalloc(pkt_sz, GFP_ATOMIC);
-                if (!packet) {
-                        /* out of memory, drop packet */
-                        netdev_err(net, "unable to alloc hv_netvsc_packet\n");
-                        ret = -ENOMEM;
-                        goto drop;
-                }
-                packet->part_of_skb = false;
-        } else {
-                /* Use the headroom for building up the packet */
-                packet = (struct hv_netvsc_packet *)skb->head;
-                packet->part_of_skb = true;
+        ret = skb_cow_head(skb, pkt_sz);
+        if (ret) {
+                netdev_err(net, "unable to alloc hv_netvsc_packet\n");
+                ret = -ENOMEM;
+                goto drop;
         }
+        /* Use the headroom for building up the packet */
+        packet = (struct hv_netvsc_packet *)skb->head;
 
         packet->status = 0;
         packet->xmit_more = skb->xmit_more;
@@ -594,8 +583,6 @@ drop:
                 net->stats.tx_bytes += skb_length;
                 net->stats.tx_packets++;
         } else {
-                if (packet && !packet->part_of_skb)
-                        kfree(packet);
                 if (ret != -EAGAIN) {
                         dev_kfree_skb_any(skb);
                         net->stats.tx_dropped++;