qeth: Fix missing pointer update

qeth_hdr_chk_and_bounce() can possibly shift the skb->data
pointer. However, the existing code didn't update the hdr pointer,
which should point to skb->data, accordingly.
Symptoms of this issue are sporadic recoveries.

Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Signed-off-by: Frank Blaschka <blaschka@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 6 insertions, 4 deletions

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index 762d6dd1e8ba..ab4d2861ef3c 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -929,7 +929,7 @@ void qeth_core_get_drvinfo(struct net_device *, struct ethtool_drvinfo *);
 void qeth_dbf_longtext(debug_info_t *id, int level, char *text, ...);
 int qeth_core_ethtool_get_settings(struct net_device *, struct ethtool_cmd *);
 int qeth_set_access_ctrl_online(struct qeth_card *card, int fallback);
-int qeth_hdr_chk_and_bounce(struct sk_buff *, int);
+int qeth_hdr_chk_and_bounce(struct sk_buff *, struct qeth_hdr **, int);
 int qeth_configure_cq(struct qeth_card *, enum qeth_cq);
 int qeth_hw_trap(struct qeth_card *, enum qeth_diags_trap_action);
 int qeth_query_ipassists(struct qeth_card *, enum qeth_prot_versions prot);
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 0aa9462c50ec..a86ce07736ef 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -3717,7 +3717,7 @@ int qeth_get_elements_no(struct qeth_card *card,
 }
 EXPORT_SYMBOL_GPL(qeth_get_elements_no);
 
-int qeth_hdr_chk_and_bounce(struct sk_buff *skb, int len)
+int qeth_hdr_chk_and_bounce(struct sk_buff *skb, struct qeth_hdr **hdr, int len)
 {
         int hroom, inpage, rest;
 
@@ -3730,6 +3730,8 @@ int qeth_hdr_chk_and_bounce(struct sk_buff *skb, int len)
                         return 1;
                 memmove(skb->data - rest, skb->data, skb->len - skb->data_len);
                 skb->data -= rest;
+                skb->tail -= rest;
+                *hdr = (struct qeth_hdr *)skb->data;
                 QETH_DBF_MESSAGE(2, "skb bounce len: %d rest: %d\n", len, rest);
         }
         return 0;
diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index e53c0c8ace76..2d425416b0a1 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -781,7 +781,7 @@ static int qeth_l2_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
         }
 
         if (card->info.type != QETH_CARD_TYPE_IQD) {
-                if (qeth_hdr_chk_and_bounce(new_skb,
+                if (qeth_hdr_chk_and_bounce(new_skb, &hdr,
                     sizeof(struct qeth_hdr_layer2)))
                         goto tx_drop;
                 rc = qeth_do_send_packet(card, queue, new_skb, hdr,
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index 29914ed8bbbc..449676e48fd0 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -3055,7 +3055,7 @@ static int qeth_l3_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
                 else
                         len = sizeof(struct qeth_hdr_layer3);
 
-                if (qeth_hdr_chk_and_bounce(new_skb, len))
+                if (qeth_hdr_chk_and_bounce(new_skb, &hdr, len))
                         goto tx_drop;
                 rc = qeth_do_send_packet(card, queue, new_skb, hdr,
                                          elements_needed);