qeth: fix page breaks in hw headers

Turning on memory debugging showed there could be page breaks in
hardware headers. OSA does not allow this so we had to add code
to bounce the header in case there is a page break. This patch also
fixes a problem in case the skb->data part of a fragmented skb
spreads multiple pages.

Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index e7942ccab987..32d07c2dcc67 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -712,10 +712,13 @@ static int qeth_l2_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
                 goto tx_drop;
         }
 
-        if (card->info.type != QETH_CARD_TYPE_IQD)
+        if (card->info.type != QETH_CARD_TYPE_IQD) {
+                if (qeth_hdr_chk_and_bounce(new_skb,
+                    sizeof(struct qeth_hdr_layer2)))
+                        goto tx_drop;
                 rc = qeth_do_send_packet(card, queue, new_skb, hdr,
                                          elements);
-        else
+        } else
                 rc = qeth_do_send_packet_fast(card, queue, new_skb, hdr,
                                         elements, data_offset, hd_len);
         if (!rc) {