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authorWANG Cong <amwang@redhat.com>2011-06-09 00:28:13 -0700
committerDavid S. Miller <davem@davemloft.net>2011-06-09 00:28:13 -0700
commit0c1ad04aecb975f2a2014e1bc5a2fa23923ecbd9 (patch)
treefe1576d55357e8f1530cc9a3df123fbf631274dc
parentfe6fe792faec3fc2d2db39b69651682b8c4e7fcb (diff)
netpoll: prevent netpoll setup on slave devices
In commit 8d8fc29d02a33e4bd5f4fa47823c1fd386346093 (netpoll: disable netpoll when enslave a device), we automatically disable netpoll when the underlying device is being enslaved, we also need to prevent people from setuping netpoll on devices that are already enslaved. Signed-off-by: WANG Cong <amwang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/core/netpoll.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 2d7d6d473781..42ea4b0e59f1 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -792,6 +792,12 @@ int netpoll_setup(struct netpoll *np)
return -ENODEV;
}
+ if (ndev->master) {
+ printk(KERN_ERR "%s: %s is a slave device, aborting.\n",
+ np->name, np->dev_name);
+ return -EBUSY;
+ }
+
if (!netif_running(ndev)) {
unsigned long atmost, atleast;