netdev - Re: /net/mpls/conf/ethX//input duplicate entry

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Date:	Wed, 10 Jun 2015 14:58:48 -0700
From:	roopa <roopa@...ulusnetworks.com>
To:	Scott Feldman <sfeldma@...il.com>
CC:	Netdev <netdev@...r.kernel.org>,
	"ebiederm@...ssion.com" <ebiederm@...ssion.com>,
	rshearma@...cade.com
Subject: Re: /net/mpls/conf/ethX//input duplicate entry

On 6/10/15, 1:43 PM, Scott Feldman wrote:
> I'm getting this dump_stack when reloading rocker driver.  Did some
> sysctl MPLS nodes not get cleaned up on NETDEV_UNREGISTER?
>
> Steps to repro: load rocker (on system) with rocker device, rmmod
> rocker, and then modprobe rocker.  I doubt this is specific to rocker:
> and re-registration of a netdev should hit it. I am using UDEV rules
> to rename kernel's ethX to a different name.  Maybe that's what
> tripped it up?
>
On a quick look, wondering if this is because mpls driver does not seem 
to do a unregister and re-register sysctl
on device name change.

diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index 7b3f732..ec21a5d 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -564,6 +564,14 @@ static int mpls_dev_notify(struct notifier_block 
*this, unsigned long event,
         case NETDEV_UNREGISTER:
                 mpls_ifdown(dev);
                 break;
+       case NETDEV_CHANGENAME:
+               mpls_ifdown(dev);
+               if ((dev->type == ARPHRD_ETHER) ||
+                   (dev->type == ARPHRD_LOOPBACK)) {
+                       mdev = mpls_add_dev(dev);
+                       if (IS_ERR(mdev))
+                               return notifier_from_errno(PTR_ERR(mdev));
+               }
         }
         return NOTIFY_OK;
  }

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