diff options
| author | Vlad Yasevich <vyasevic@redhat.com> | 2013-06-25 16:04:20 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-06-25 16:44:56 -0700 |
| commit | ac4e4af1e59e16a018527ffa58d9d3f30bb96ca9 (patch) | |
| tree | 310295ae1fffa64e94f8f3d733465d652925149a /drivers | |
| parent | 441ac0fcaadc76ad09771812382345001dd2b813 (diff) | |
| download | linux-ac4e4af1e59e16a018527ffa58d9d3f30bb96ca9.tar.bz2 | |
macvtap: Consistently use rcu functions
Currently macvtap uses rcu_bh functions in its
user facing fuction macvtap_get_user() and macvtap_put_user().
However, its packet handlers use normal rcu as the rcu_read_lock()
is taken in netif_receive_skb(). We can safely discontinue
the usage or rcu with bh disabled.
Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/macvtap.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c index efbf2eb6ae78..d7856a8f589a 100644 --- a/drivers/net/macvtap.c +++ b/drivers/net/macvtap.c @@ -754,8 +754,8 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m, skb_probe_transport_header(skb, ETH_HLEN); - rcu_read_lock_bh(); - vlan = rcu_dereference_bh(q->vlan); + rcu_read_lock(); + vlan = rcu_dereference(q->vlan); /* copy skb_ubuf_info for callback when skb has no error */ if (zerocopy) { skb_shinfo(skb)->destructor_arg = m->msg_control; @@ -766,7 +766,7 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m, macvlan_start_xmit(skb, vlan->dev); else kfree_skb(skb); - rcu_read_unlock_bh(); + rcu_read_unlock(); return total_len; @@ -774,11 +774,11 @@ err_kfree: kfree_skb(skb); err: - rcu_read_lock_bh(); - vlan = rcu_dereference_bh(q->vlan); + rcu_read_lock(); + vlan = rcu_dereference(q->vlan); if (vlan) vlan->dev->stats.tx_dropped++; - rcu_read_unlock_bh(); + rcu_read_unlock(); return err; } @@ -854,11 +854,11 @@ static ssize_t macvtap_put_user(struct macvtap_queue *q, copied += len; done: - rcu_read_lock_bh(); - vlan = rcu_dereference_bh(q->vlan); + rcu_read_lock(); + vlan = rcu_dereference(q->vlan); if (vlan) macvlan_count_rx(vlan, copied - vnet_hdr_len, ret == 0, 0); - rcu_read_unlock_bh(); + rcu_read_unlock(); return ret ? ret : copied; } |