[SK_BUFF]: Introduce skb_copy_from_linear_data{_offset}

To clearly state the intent of copying from linear sk_buffs, _offset being a
overly long variant but interesting for the sake of saving some bytes.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 8 insertions, 5 deletions

diff --git a/drivers/s390/net/ctcmain.c b/drivers/s390/net/ctcmain.c
index 54e3f806cd52..b0f813e6f48e 100644
--- a/drivers/s390/net/ctcmain.c
+++ b/drivers/s390/net/ctcmain.c
@@ -472,7 +472,8 @@ ctc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
                         privptr->stats.rx_dropped++;
                         return;
                 }
-                memcpy(skb_put(skb, pskb->len), pskb->data, pskb->len);
+                skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
+                                          pskb->len);
                 skb_reset_mac_header(skb);
                 skb->dev = pskb->dev;
                 skb->protocol = pskb->protocol;
@@ -716,8 +717,9 @@ ch_action_txdone(fsm_instance * fi, int event, void *arg)
                 *((__u16 *) skb_put(ch->trans_skb, 2)) = ch->collect_len + 2;
                 i = 0;
                 while ((skb = skb_dequeue(&ch->collect_queue))) {
-                        memcpy(skb_put(ch->trans_skb, skb->len), skb->data,
-                               skb->len);
+                        skb_copy_from_linear_data(skb, skb_put(ch->trans_skb,
+                                                               skb->len),
+                                                  skb->len);
                         privptr->stats.tx_packets++;
                         privptr->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
                         atomic_dec(&skb->users);
@@ -2268,8 +2270,9 @@ transmit_skb(struct channel *ch, struct sk_buff *skb)
                         skb_reset_tail_pointer(ch->trans_skb);
                         ch->trans_skb->len = 0;
                         ch->ccw[1].count = skb->len;
-                        memcpy(skb_put(ch->trans_skb, skb->len), skb->data,
-                               skb->len);
+                        skb_copy_from_linear_data(skb, skb_put(ch->trans_skb,
+                                                               skb->len),
+                                                  skb->len);
                         atomic_dec(&skb->users);
                         dev_kfree_skb_irq(skb);
                         ccw_idx = 0;