From: sfel...@gmail.com
Date: Wed, 10 Jun 2015 13:56:02 -0700

> From: Scott Feldman <sfel...@gmail.com>
> 
> Fix a BUG() where CONFIG_NET_SWITCHDEV is set but the driver for a bridged
> port does not support switchdec_port_attr_set op.  Don't BUG() if
> -EOPNOTSUPP is returned.
> 
> Signed-off-by: Scott Feldman <sfel...@gmail.com>
> Reported-by: Brenden Blanco <bbla...@plumgrid.com>
> ---
>  net/switchdev/switchdev.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
> index e008057..99bced4 100644
> --- a/net/switchdev/switchdev.c
> +++ b/net/switchdev/switchdev.c
> @@ -103,7 +103,7 @@ static void switchdev_port_attr_set_work(struct 
> work_struct *work)
>  
>       rtnl_lock();
>       err = switchdev_port_attr_set(asw->dev, &asw->attr);
> -     BUG_ON(err);
> +     BUG_ON(err && err != -EOPNOTSUPP);
>       rtnl_unlock();
>  
>       dev_put(asw->dev);

I agree with other feedback, in that this function can return other "normal"
errors like -ENOMEM and that's not absolutely not BUG_ON() material.
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