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Subject[net-next PATCH 4/8] macvtap: introduce macvtap_get_vlan()
Date
Factor out the device holding logic to a macvtap_get_vlan(), this will be also
used by multiqueue API.

Signed-off-by: Jason Wang <jasowang@redhat.com>
---
drivers/net/macvtap.c | 27 ++++++++++++++++++++-------
1 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index 8949631..d18130b 100644
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -893,6 +893,24 @@ out:
return ret;
}

+static struct macvlan_dev *macvtap_get_vlan(struct macvtap_queue *q)
+{
+ struct macvlan_dev *vlan;
+
+ rcu_read_lock_bh();
+ vlan = rcu_dereference_bh(q->vlan);
+ if (vlan)
+ dev_hold(vlan->dev);
+ rcu_read_unlock_bh();
+
+ return vlan;
+}
+
+static void macvtap_put_vlan(struct macvlan_dev *vlan)
+{
+ dev_put(vlan->dev);
+}
+
/*
* provide compatibility with generic tun/tap interface
*/
@@ -924,12 +942,7 @@ static long macvtap_ioctl(struct file *file, unsigned int cmd,
return ret;

case TUNGETIFF:
- rcu_read_lock_bh();
- vlan = rcu_dereference_bh(q->vlan);
- if (vlan)
- dev_hold(vlan->dev);
- rcu_read_unlock_bh();
-
+ vlan = macvtap_get_vlan(q);
if (!vlan)
return -ENOLINK;

@@ -937,7 +950,7 @@ static long macvtap_ioctl(struct file *file, unsigned int cmd,
if (copy_to_user(&ifr->ifr_name, vlan->dev->name, IFNAMSIZ) ||
put_user(q->flags, &ifr->ifr_flags))
ret = -EFAULT;
- dev_put(vlan->dev);
+ macvtap_put_vlan(vlan);
return ret;

case TUNGETFEATURES:
--
1.7.1


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