On Fri, 2015-08-14 at 14:14 -0700, Eric Dumazet wrote:
> While rebooting host running latest net-next
>
> unregister_netdevice: waiting for eth0 to become free. Usage count = 4
>
> Oh well...
>
It looks like David Ahern recent changes uncover a bug ?
Not clear which commit is at fault.
Maybe 3bfd847203c6d89532f836ad3f5b4ff4ced26dd9 ?
Somehow a down device can be found.
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index b7f1d20..675a3b6 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -725,10 +725,14 @@ static int fib_check_nh(struct fib_config *cfg, struct
fib_info *fi,
nh->nh_dev = dev = FIB_RES_DEV(res);
if (!dev)
goto out;
- dev_hold(dev);
if (!netif_carrier_ok(dev))
nh->nh_flags |= RTNH_F_LINKDOWN;
- err = (dev->flags & IFF_UP) ? 0 : -ENETDOWN;
+ if (dev->flags & IFF_UP) {
+ err = 0;
+ dev_hold(dev);
+ } else {
+ err = -ENETDOWN;
+ }
} else {
struct in_device *in_dev;
--
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