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vlan: add rtnl_dereference() annotations 

The original code generates a Sparse warning:
net/8021q/vlan_core.c:336:9:
	error: incompatible types in comparison expression (different address spaces)

It's ok to dereference __rcu pointers here because we are holding the
RTNL lock.  I've added some calls to rtnl_dereference() to silence the
warning.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: Jiri Pirko <jpirko@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dan Carpenter 2011-12-13 20:29:43 +00:00 committed by David S. Miller
parent c63044f0d2
commit f9586f79bf
1 changed files with 9 additions and 5 deletions
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14
net/8021q/vlan_core.c
View File

@ -326,14 +326,16 @@ int vlan_vids_add_by_dev(struct net_device *dev,
const struct net_device *by_dev)
{
struct vlan_vid_info *vid_info;
struct vlan_info *vlan_info;
int err;
ASSERT_RTNL();
if (!by_dev->vlan_info)
vlan_info = rtnl_dereference(by_dev->vlan_info);
if (!vlan_info)
return 0;
list_for_each_entry(vid_info, &by_dev->vlan_info->vid_list, list) {
list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
err = vlan_vid_add(dev, vid_info->vid);
if (err)
goto unwind;
@ -342,7 +344,7 @@ int vlan_vids_add_by_dev(struct net_device *dev,
unwind:
list_for_each_entry_continue_reverse(vid_info,
&by_dev->vlan_info->vid_list,
&vlan_info->vid_list,
list) {
vlan_vid_del(dev, vid_info->vid);
}
@ -355,13 +357,15 @@ void vlan_vids_del_by_dev(struct net_device *dev,
const struct net_device *by_dev)
{
struct vlan_vid_info *vid_info;
struct vlan_info *vlan_info;
ASSERT_RTNL();
if (!by_dev->vlan_info)
vlan_info = rtnl_dereference(by_dev->vlan_info);
if (!vlan_info)
return;
list_for_each_entry(vid_info, &by_dev->vlan_info->vid_list, list)
list_for_each_entry(vid_info, &vlan_info->vid_list, list)
vlan_vid_del(dev, vid_info->vid);
}
EXPORT_SYMBOL(vlan_vids_del_by_dev);