linux-kernel - Re: [PATCH 2.6.27-rc8 4/6] e1000e: drop stats lock

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Date:	Fri, 3 Oct 2008 02:38:14 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Jesse Brandeburg <jesse.brandeburg@...el.com>
cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, arjan@...ux.intel.com, airlied@...il.com,
	davem@...emloft.net, jeff@...zik.org
Subject: Re: [PATCH 2.6.27-rc8 4/6] e1000e: drop stats lock



On Thu, 2 Oct 2008, Jesse Brandeburg wrote:

> the stats lock is left over from e1000, e1000e no longer
> has the adjust tbi stats function that required the addition
> of the stats lock to begin with.
> 
> adding a mutex to acquire_swflag helped catch this one too.
> 
> Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
> CC: Thomas Gleixner <tglx@...utronix.de>

Acked-by: Thomas Gleixner <tglx@...utronix.de>


> ---
> 
>  drivers/net/e1000e/e1000.h  |    1 -
>  drivers/net/e1000e/netdev.c |   18 ------------------
>  2 files changed, 0 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/net/e1000e/e1000.h b/drivers/net/e1000e/e1000.h
> index 8087bda..5ea6b60 100644
> --- a/drivers/net/e1000e/e1000.h
> +++ b/drivers/net/e1000e/e1000.h
> @@ -257,7 +257,6 @@ struct e1000_adapter {
>  	struct net_device *netdev;
>  	struct pci_dev *pdev;
>  	struct net_device_stats net_stats;
> -	spinlock_t stats_lock;      /* prevent concurrent stats updates */
>  
>  	/* structs defined in e1000_hw.h */
>  	struct e1000_hw hw;
> diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
> index 835b692..01e9558 100644
> --- a/drivers/net/e1000e/netdev.c
> +++ b/drivers/net/e1000e/netdev.c
> @@ -2600,8 +2600,6 @@ static int __devinit e1000_sw_init(struct e1000_adapter *adapter)
>  	/* Explicitly disable IRQ since the NIC can be in any state. */
>  	e1000_irq_disable(adapter);
>  
> -	spin_lock_init(&adapter->stats_lock);
> -
>  	set_bit(__E1000_DOWN, &adapter->state);
>  	return 0;
>  
> @@ -2953,7 +2951,6 @@ void e1000e_update_stats(struct e1000_adapter *adapter)
>  {
>  	struct e1000_hw *hw = &adapter->hw;
>  	struct pci_dev *pdev = adapter->pdev;
> -	unsigned long irq_flags;
>  
>  	/*
>  	 * Prevent stats update while adapter is being reset, or if the pci
> @@ -2964,14 +2961,6 @@ void e1000e_update_stats(struct e1000_adapter *adapter)
>  	if (pci_channel_offline(pdev))
>  		return;
>  
> -	spin_lock_irqsave(&adapter->stats_lock, irq_flags);
> -
> -	/*
> -	 * these counters are modified from e1000_adjust_tbi_stats,
> -	 * called from the interrupt context, so they must only
> -	 * be written while holding adapter->stats_lock
> -	 */
> -
>  	adapter->stats.crcerrs += er32(CRCERRS);
>  	adapter->stats.gprc += er32(GPRC);
>  	adapter->stats.gorc += er32(GORCL);
> @@ -3046,8 +3035,6 @@ void e1000e_update_stats(struct e1000_adapter *adapter)
>  	adapter->stats.mgptc += er32(MGTPTC);
>  	adapter->stats.mgprc += er32(MGTPRC);
>  	adapter->stats.mgpdc += er32(MGTPDC);
> -
> -	spin_unlock_irqrestore(&adapter->stats_lock, irq_flags);
>  }
>  
>  /**
> @@ -3059,9 +3046,6 @@ static void e1000_phy_read_status(struct e1000_adapter *adapter)
>  	struct e1000_hw *hw = &adapter->hw;
>  	struct e1000_phy_regs *phy = &adapter->phy_regs;
>  	int ret_val;
> -	unsigned long irq_flags;
> -
> -	spin_lock_irqsave(&adapter->stats_lock, irq_flags);
>  
>  	if ((er32(STATUS) & E1000_STATUS_LU) &&
>  	    (adapter->hw.phy.media_type == e1000_media_type_copper)) {
> @@ -3092,8 +3076,6 @@ static void e1000_phy_read_status(struct e1000_adapter *adapter)
>  		phy->stat1000 = 0;
>  		phy->estatus = (ESTATUS_1000_TFULL | ESTATUS_1000_THALF);
>  	}
> -
> -	spin_unlock_irqrestore(&adapter->stats_lock, irq_flags);
>  }
>  
>  static void e1000_print_link_info(struct e1000_adapter *adapter)
> 
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