linux-kernel - Re: [PATCH v3 4/5] staging: et131x: remove spinlock adapter->lock

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Date:	Thu, 21 Nov 2013 21:19:53 +0000
From:	Mark Einon <mark.einon@...il.com>
To:	ZHAO Gang <gamerh2o@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org
Subject: Re: [PATCH v3 4/5] staging: et131x: remove spinlock adapter->lock

On Wed, Nov 20, 2013 at 03:57:15PM +0800, ZHAO Gang wrote:
> adapter->lock is only used in et131x_multicast(), which is eventually
> called by network stack function __dev_set_rx_mode(). __dev_set_rx_mode()
> is always called by (net_device *)dev->addr_list_lock hold, to protect from
> concurrent access. So adapter->lock is redundant.
> 
> Signed-off-by: ZHAO Gang <gamerh2o@...il.com>

Acked-by: Mark Einon <mark.einon@...il.com>

> ---
>  drivers/staging/et131x/et131x.c | 6 ------
>  1 file changed, 6 deletions(-)
> 
> diff --git a/drivers/staging/et131x/et131x.c b/drivers/staging/et131x/et131x.c
> index 6254a6b..66530b1 100644
> --- a/drivers/staging/et131x/et131x.c
> +++ b/drivers/staging/et131x/et131x.c
> @@ -486,8 +486,6 @@ struct et131x_adapter {
>  	u8 eeprom_data[2];
>  
>  	/* Spinlocks */
> -	spinlock_t lock;
> -
>  	spinlock_t tcb_send_qlock;
>  	spinlock_t tcb_ready_qlock;
>  	spinlock_t send_hw_lock;
> @@ -3867,7 +3865,6 @@ static struct et131x_adapter *et131x_adapter_init(struct net_device *netdev,
>  	adapter->netdev = netdev;
>  
>  	/* Initialize spinlocks here */
> -	spin_lock_init(&adapter->lock);
>  	spin_lock_init(&adapter->tcb_send_qlock);
>  	spin_lock_init(&adapter->tcb_ready_qlock);
>  	spin_lock_init(&adapter->send_hw_lock);
> @@ -4429,8 +4426,6 @@ static void et131x_multicast(struct net_device *netdev)
>  	struct netdev_hw_addr *ha;
>  	int i;
>  
> -	spin_lock_irqsave(&adapter->lock, flags);
> -
>  	/* Before we modify the platform-independent filter flags, store them
>  	 * locally. This allows us to determine if anything's changed and if
>  	 * we even need to bother the hardware
> @@ -4484,7 +4479,6 @@ static void et131x_multicast(struct net_device *netdev)
>  		/* Call the device's filter function */
>  		et131x_set_packet_filter(adapter);
>  	}
> -	spin_unlock_irqrestore(&adapter->lock, flags);
>  }
>  
>  /* et131x_tx - The handler to tx a packet on the device
> -- 
> 1.8.3.1
> 
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