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qeth: l3 fix rcu splat in xmit 

when use dst_get_neighbour to get neighbour, we need
rcu_read_lock to protect, since dst_get_neighbour uses
rcu_dereference.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Frank Blaschka 2011-11-15 02:31:15 +00:00 committed by David S. Miller
parent 1d503563f7
commit 1d36cb479f
1 changed files with 7 additions and 0 deletions
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7
drivers/s390/net/qeth_l3_main.c
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@ -2756,11 +2756,13 @@ int inline qeth_l3_get_cast_type(struct qeth_card *card, struct sk_buff *skb)
struct neighbour *n = NULL;
struct dst_entry *dst;
rcu_read_lock();
dst = skb_dst(skb);
if (dst)
n = dst_get_neighbour(dst);
if (n) {
cast_type = n->type;
rcu_read_unlock();
if ((cast_type == RTN_BROADCAST) ||
(cast_type == RTN_MULTICAST) ||
(cast_type == RTN_ANYCAST))
@ -2768,6 +2770,8 @@ int inline qeth_l3_get_cast_type(struct qeth_card *card, struct sk_buff *skb)
else
return RTN_UNSPEC;
}
rcu_read_unlock();
/* try something else */
if (skb->protocol == ETH_P_IPV6)
return (skb_network_header(skb)[24] == 0xff) ?
@ -2847,6 +2851,8 @@ static void qeth_l3_fill_header(struct qeth_card *card, struct qeth_hdr *hdr,
}
hdr->hdr.l3.length = skb->len - sizeof(struct qeth_hdr);
rcu_read_lock();
dst = skb_dst(skb);
if (dst)
n = dst_get_neighbour(dst);
@ -2893,6 +2899,7 @@ static void qeth_l3_fill_header(struct qeth_card *card, struct qeth_hdr *hdr,
QETH_CAST_UNICAST | QETH_HDR_PASSTHRU;
}
}
rcu_read_unlock();
}
static inline void qeth_l3_hdr_csum(struct qeth_card *card,