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

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Message-ID: <20150506140908.GA4457@neilslaptop.think-freely.org>
Date:	Wed, 6 May 2015 10:09:08 -0400
From:	Neil Horman <nhorman@...hat.com>
To:	Tony Camuso <tcamuso@...hat.com>
Cc:	linux-kernel@...r.kernel.org, netdev@...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 (2)

On Wed, May 06, 2015 at 09:09:18AM -0400, Tony Camuso wrote:
> This patch should have been part of the previous patch having the
> same summary. See  http://marc.info/?l=linux-kernel&m=143039470103795&w=2
> Unfortunately, I didn't check to see where else this lock was used before
> submitting that patch. This should take care of it for netxen_nic, as I
> did a thorough search this time.
> 
> To recap from the original patch; although 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 _bh
> versions of spin_[un]lock, 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 2da9627..6301bae 100644
> --- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c
> +++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c
> @@ -1766,7 +1766,7 @@ int netxen_process_cmd_ring(struct netxen_adapter *adapter)
>  	int done = 0;
>  	struct nx_host_tx_ring *tx_ring = adapter->tx_ring;
>  
> -	if (!spin_trylock(&adapter->tx_clean_lock))
> +	if (!spin_trylock_bh(&adapter->tx_clean_lock))
>  		return 1;
>  
>  	sw_consumer = tx_ring->sw_consumer;
> @@ -1821,7 +1821,7 @@ int netxen_process_cmd_ring(struct netxen_adapter *adapter)
>  	 */
>  	hw_consumer = le32_to_cpu(*(tx_ring->hw_consumer));
>  	done = (sw_consumer == hw_consumer);
> -	spin_unlock(&adapter->tx_clean_lock);
> +	spin_unlock_bh(&adapter->tx_clean_lock);
>  
>  	return done;
>  }
> -- 
> 1.8.3.1
> 
Acked-By: Neil Horman <nhorman@...driver.com>

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