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netpoll: prevent netpoll setup on slave devices

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In commit 8d8fc29d02
(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>
This commit is contained in:
WANG Cong 2011-06-09 00:28:13 -07:00 committed by David S. Miller
parent fe6fe792fa
commit 0c1ad04aec
1 changed files with 6 additions and 0 deletions
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6
net/core/netpoll.c
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@ -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;