netdev - Re: [PATCH] Revert "netpoll: Fix extra refcount release in netpoll

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Date:	Wed, 6 Apr 2016 09:48:37 -0400
From:	Neil Horman <nhorman@...hat.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alexander Duyck <aduyck@...antis.com>,
	Bart Van Assche <bart.vanassche@...disk.com>
Subject: Re: [PATCH] Revert "netpoll: Fix extra refcount release in
 netpoll_cleanup()"

On Tue, Apr 05, 2016 at 03:58:22PM -0500, Bjorn Helgaas wrote:
> This reverts commit 543e3a8da5a4c453e992d5351ef405d5e32f27d7.
> 
> Direct callers of __netpoll_setup() depend on it to set np->dev,
> so we can't simply move that assignment up to netpoll_stup().
> 
> Reported-by: Bart Van Assche <bart.vanassche@...disk.com>
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> ---
>  net/core/netpoll.c |    3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/net/core/netpoll.c b/net/core/netpoll.c
> index a57bd17..94acfc8 100644
> --- a/net/core/netpoll.c
> +++ b/net/core/netpoll.c
> @@ -603,6 +603,7 @@ int __netpoll_setup(struct netpoll *np, struct net_device *ndev)
>  	const struct net_device_ops *ops;
>  	int err;
>  
> +	np->dev = ndev;
>  	strlcpy(np->dev_name, ndev->name, IFNAMSIZ);
>  	INIT_WORK(&np->cleanup_work, netpoll_async_cleanup);
>  
> @@ -669,7 +670,6 @@ int netpoll_setup(struct netpoll *np)
>  		goto unlock;
>  	}
>  	dev_hold(ndev);
> -	np->dev = ndev;
>  
>  	if (netdev_master_upper_dev_get(ndev)) {
>  		np_err(np, "%s is a slave device, aborting\n", np->dev_name);
> @@ -770,7 +770,6 @@ int netpoll_setup(struct netpoll *np)
>  	return 0;
>  
>  put:
> -	np->dev = NULL;
>  	dev_put(ndev);
>  unlock:
>  	rtnl_unlock();
> 
Acked-by: Neil Horman <nhorman@...driver.com>