netpoll setup error handling

The beast was not always healthy. When it was sick,
it tended to be laconic and not tell anyone the real problem.
A few small changes had it telling the world about its
problems, if they really wanted to hear.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>

1 files changed, 13 insertions, 7 deletions

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index ac4e8b8f57d1..621baa5da49f 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -611,20 +611,23 @@ int netpoll_setup(struct netpoll *np)
         struct in_device *in_dev;
         struct netpoll_info *npinfo;
         unsigned long flags;
+        int err;
 
         if (np->dev_name)
                 ndev = dev_get_by_name(np->dev_name);
         if (!ndev) {
                 printk(KERN_ERR "%s: %s doesn't exist, aborting.\n",
                        np->name, np->dev_name);
-                return -1;
+                return -ENODEV;
         }
 
         np->dev = ndev;
         if (!ndev->npinfo) {
                 npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL);
-                if (!npinfo)
+                if (!npinfo) {
+                        err = -ENOMEM;
                         goto release;
+                }
 
                 npinfo->rx_flags = 0;
                 npinfo->rx_np = NULL;
@@ -645,6 +648,7 @@ int netpoll_setup(struct netpoll *np)
         if (!ndev->poll_controller) {
                 printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n",
                        np->name, np->dev_name);
+                err = -ENOTSUPP;
                 goto release;
         }
 
@@ -655,13 +659,14 @@ int netpoll_setup(struct netpoll *np)
                        np->name, np->dev_name);
 
                 rtnl_lock();
-                if (dev_change_flags(ndev, ndev->flags | IFF_UP) < 0) {
+                err = dev_open(ndev);
+                rtnl_unlock();
+
+                if (err) {
                         printk(KERN_ERR "%s: failed to open %s\n",
-                               np->name, np->dev_name);
-                        rtnl_unlock();
+                               np->name, ndev->name);
                         goto release;
                 }
-                rtnl_unlock();
 
                 atleast = jiffies + HZ/10;
                 atmost = jiffies + 4*HZ;
@@ -699,6 +704,7 @@ int netpoll_setup(struct netpoll *np)
                         rcu_read_unlock();
                         printk(KERN_ERR "%s: no IP address for %s, aborting\n",
                                np->name, np->dev_name);
+                        err = -EDESTADDRREQ;
                         goto release;
                 }
 
@@ -731,7 +737,7 @@ int netpoll_setup(struct netpoll *np)
                 kfree(npinfo);
         np->dev = NULL;
         dev_put(ndev);
-        return -1;
+        return err;
 }
 
 static int __init netpoll_init(void) {