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Date:	Tue, 15 Apr 2014 08:07:49 +0000
From:	Sathya Perla <Sathya.Perla@...lex.Com>
To:	"Li, Zhen-Hua" <zhen-hual@...com>,
	Subramanian Seetharaman <subbu.seetharaman@...lex.com>,
	Ajit Khaparde <Ajit.Khaparde@...lex.Com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/1] driver/net: add missing rtnl lock/unlock for benet

> -----Original Message-----
> From: Li, Zhen-Hua [mailto:zhen-hual@...com]
> 
> In benet driver, netif_device_detach and netif_device_attach should be
> called between rtnl_lock and rtnl_unlock.

Zhen, it's not clear to me why rtnl_lock is needed around netif_device_attach().
Can you pls explain what exact data-structure you are protecting with the lock?

Are you see warning stack trace? I don't see ASSERT_RTNL() called anywhere from netif_device_attach/detach()?

thanks!

> 
> Signed-off-by: Li, Zhen-Hua <zhen-hual@...com>
> ---
>  drivers/net/ethernet/emulex/benet/be_main.c |   17 ++++++++++++++---
>  1 file changed, 14 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/emulex/benet/be_main.c
> b/drivers/net/ethernet/emulex/benet/be_main.c
> index 3e6df47..9c44b3f 100644
> --- a/drivers/net/ethernet/emulex/benet/be_main.c
> +++ b/drivers/net/ethernet/emulex/benet/be_main.c
> @@ -4555,8 +4555,11 @@ static void be_func_recovery_task(struct work_struct *work)
>  		rtnl_unlock();
> 
>  		status = lancer_recover_func(adapter);
> -		if (!status)
> +		if (!status) {
> +			rtnl_lock();
>  			netif_device_attach(adapter->netdev);
> +			rtnl_unlock();
> +		}
>  	}
> 
>  	/* In Lancer, for all errors other than provisioning error (-EAGAIN),
> @@ -4784,12 +4787,12 @@ static int be_suspend(struct pci_dev *pdev, pm_message_t
> state)
>  	be_intr_set(adapter, false);
>  	cancel_delayed_work_sync(&adapter->func_recovery_work);
> 
> +	rtnl_lock();
>  	netif_device_detach(netdev);
>  	if (netif_running(netdev)) {
> -		rtnl_lock();
>  		be_close(netdev);
> -		rtnl_unlock();
>  	}
> +	rtnl_unlock();
>  	be_clear(adapter);
> 
>  	pci_save_state(pdev);
> @@ -4804,7 +4807,9 @@ static int be_resume(struct pci_dev *pdev)
>  	struct be_adapter *adapter = pci_get_drvdata(pdev);
>  	struct net_device *netdev =  adapter->netdev;
> 
> +	rtnl_lock();
>  	netif_device_detach(netdev);
> +	rtnl_unlock();
> 
>  	status = pci_enable_device(pdev);
>  	if (status)
> @@ -4832,7 +4837,9 @@ static int be_resume(struct pci_dev *pdev)
> 
>  	schedule_delayed_work(&adapter->func_recovery_work,
>  			      msecs_to_jiffies(1000));
> +	rtnl_lock();
>  	netif_device_attach(netdev);
> +	rtnl_unlock();
> 
>  	if (adapter->wol_en)
>  		be_setup_wol(adapter, false);
> @@ -4853,7 +4860,9 @@ static void be_shutdown(struct pci_dev *pdev)
>  	cancel_delayed_work_sync(&adapter->work);
>  	cancel_delayed_work_sync(&adapter->func_recovery_work);
> 
> +	rtnl_lock();
>  	netif_device_detach(adapter->netdev);
> +	rtnl_unlock();
> 
>  	be_cmd_reset_function(adapter);
> 
> @@ -4957,7 +4966,9 @@ static void be_eeh_resume(struct pci_dev *pdev)
> 
>  	schedule_delayed_work(&adapter->func_recovery_work,
>  			      msecs_to_jiffies(1000));
> +	rtnl_lock();
>  	netif_device_attach(netdev);
> +	rtnl_unlock();
>  	return;
>  err:
>  	dev_err(&adapter->pdev->dev, "EEH resume failed\n");
> --
> 1.7.10.4

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