netpoll: prevent netpoll setup on slave devices

[sfrench/cifs-2.6.git] / net / core / netpoll.c

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 2d7d6d4737810c0bd9d0b93defbf2c972f1c6b2e..42ea4b0e59f1d3a780d57e9836181f055cb2c006 100644 (file)
--- 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;