linux-kernel - Re: [PATCH] netxen_nic: use spin_[un]lock_bh around tx_clean

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Date:	Thu, 30 Apr 2015 08:58:26 -0400
From:	Neil Horman <nhorman@...hat.com>
To:	Tony Camuso <tcamuso@...hat.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	manish.chopra@...gic.com, sony.chacko@...gic.com,
	rajesh.borundia@...gic.com
Subject: Re: [PATCH] netxen_nic: use spin_[un]lock_bh around tx_clean_lock

On Thu, Apr 30, 2015 at 07:51:27AM -0400, Tony Camuso wrote:
> While testing this driver with DEBUG_LOCKDEP and DEBUG_SPINLOCK
> enabled did not produce any traces, it would be more prudent in the
> case of tx_clean_lock to use spin_[un]lock_bh, since this lock is
> manipulated in both the process and softirq contexts.
> 
> This patch was tested for functionality and regressions with netperf
> and DEBUG_LOCKDEP and DEBUG_SPINLOCK enabled.
> 
> Signed-off-by: Tony Camuso <tcamuso@...hat.com>
> 
> ---
>  drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c b/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c
> index d746c97..2da9627 100644
> --- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c
> +++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c
> @@ -137,7 +137,7 @@ void netxen_release_tx_buffers(struct netxen_adapter *adapter)
>  	int i, j;
>  	struct nx_host_tx_ring *tx_ring = adapter->tx_ring;
>  
> -	spin_lock(&adapter->tx_clean_lock);
> +	spin_lock_bh(&adapter->tx_clean_lock);
>  	cmd_buf = tx_ring->cmd_buf_arr;
>  	for (i = 0; i < tx_ring->num_desc; i++) {
>  		buffrag = cmd_buf->frag_array;
> @@ -161,7 +161,7 @@ void netxen_release_tx_buffers(struct netxen_adapter *adapter)
>  		}
>  		cmd_buf++;
>  	}
> -	spin_unlock(&adapter->tx_clean_lock);
> +	spin_unlock_bh(&adapter->tx_clean_lock);
>  }
>  
>  void netxen_free_sw_resources(struct netxen_adapter *adapter)
> -- 
> 1.8.3.1
> 

Acked-by: Neil Horman <nhorman@...driver.com>
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