Factor out the device holding logic to a macvtap_get_vlan(), this will be also
used by multiqueue API.
Signed-off-by: Jason Wang <jasow...@redhat.com>
---
drivers/net/macvtap.c | 26 +++++++++++++++++++-------
1 files changed, 19 insertions(+), 7 deletions(-)
diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index ce1c72a..a36e49e 100644
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -890,6 +890,23 @@ 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
*/
@@ -921,12 +938,7 @@ 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 -EBADFD;
@@ -934,7 +946,7 @@ 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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