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| author | Frank Blaschka <frank.blaschka@de.ibm.com> | 2011-11-15 02:31:15 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-11-16 17:28:14 -0500 |
| commit | 1d36cb479f204a0fedc1a3e7ce7b32c0a2c48769 (patch) | |
| tree | 17ec1075b6d239c6e3113e34ed7c78511a820e90 /drivers/s390/net/qeth_l3_main.c | |
| parent | 1d503563f7601a249d015d3fad40b08e8d6a394b (diff) | |
| download | linux-3.10-1d36cb479f204a0fedc1a3e7ce7b32c0a2c48769.tar.gz linux-3.10-1d36cb479f204a0fedc1a3e7ce7b32c0a2c48769.tar.bz2 linux-3.10-1d36cb479f204a0fedc1a3e7ce7b32c0a2c48769.zip | |
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>
Diffstat (limited to 'drivers/s390/net/qeth_l3_main.c')
| -rw-r--r-- | drivers/s390/net/qeth_l3_main.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c index e4c1176ee25..4d5307ddbe5 100644 --- a/drivers/s390/net/qeth_l3_main.c +++ b/drivers/s390/net/qeth_l3_main.c @@ -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, |