netdev - Re: [PATCH 2/2] fec: don't enable irqs in hard irq context

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Date:	Thu, 03 Sep 2009 11:14:24 +1000
From:	Greg Ungerer <gerg@...pgear.com>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
CC:	linux-rt-users@...r.kernel.org,
	Ben Hutchings <ben@...adent.org.uk>,
	Patrick McHardy <kaber@...sh.net>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Matt Waddel <Matt.Waddel@...escale.com>,
	netdev@...r.kernel.org,
	Tim Sander <tim01@...i.informatik.tu-darmstadt.de>
Subject: Re: [PATCH 2/2] fec: don't enable irqs in hard irq context

Hi Uwe,

Uwe Kleine-König wrote:
> fec_enet_mii, fec_enet_rx and fec_enet_tx are both only called by
> fec_enet_interrupt in interrupt context.  So they must not use
> spin_lock_irq/spin_unlock_irq.
> 
> This fixes:
> 	WARNING: at kernel/lockdep.c:2140 trace_hardirqs_on_caller+0x130/0x194()
> 	...
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> Cc: Greg Ungerer <gerg@...inux.org>

Looks good.

Acked-by: Greg Ungerer <gerg@...inux.org>


> Cc: Ben Hutchings <ben@...adent.org.uk>
> Cc: Patrick McHardy <kaber@...sh.net>
> Cc: Sascha Hauer <s.hauer@...gutronix.de>
> Cc: Matt Waddel <Matt.Waddel@...escale.com>
> Cc: netdev@...r.kernel.org
> Cc: Tim Sander <tim01@...i.informatik.tu-darmstadt.de>
> ---
>  drivers/net/fec.c |   12 ++++++------
>  1 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/fec.c b/drivers/net/fec.c
> index ef82606..9c49d56 100644
> --- a/drivers/net/fec.c
> +++ b/drivers/net/fec.c
> @@ -427,7 +427,7 @@ fec_enet_tx(struct net_device *dev)
>  	struct	sk_buff	*skb;
>  
>  	fep = netdev_priv(dev);
> -	spin_lock_irq(&fep->hw_lock);
> +	spin_lock(&fep->hw_lock);
>  	bdp = fep->dirty_tx;
>  
>  	while (((status = bdp->cbd_sc) & BD_ENET_TX_READY) == 0) {
> @@ -486,7 +486,7 @@ fec_enet_tx(struct net_device *dev)
>  		}
>  	}
>  	fep->dirty_tx = bdp;
> -	spin_unlock_irq(&fep->hw_lock);
> +	spin_unlock(&fep->hw_lock);
>  }
>  
>  
> @@ -509,7 +509,7 @@ fec_enet_rx(struct net_device *dev)
>  	flush_cache_all();
>  #endif
>  
> -	spin_lock_irq(&fep->hw_lock);
> +	spin_lock(&fep->hw_lock);
>  
>  	/* First, grab all of the stats for the incoming packet.
>  	 * These get messed up if we get called due to a busy condition.
> @@ -604,7 +604,7 @@ rx_processing_done:
>  	}
>  	fep->cur_rx = bdp;
>  
> -	spin_unlock_irq(&fep->hw_lock);
> +	spin_unlock(&fep->hw_lock);
>  }
>  
>  /* called from interrupt context */
> @@ -615,7 +615,7 @@ fec_enet_mii(struct net_device *dev)
>  	mii_list_t	*mip;
>  
>  	fep = netdev_priv(dev);
> -	spin_lock_irq(&fep->mii_lock);
> +	spin_lock(&fep->mii_lock);
>  
>  	if ((mip = mii_head) == NULL) {
>  		printk("MII and no head!\n");
> @@ -633,7 +633,7 @@ fec_enet_mii(struct net_device *dev)
>  		writel(mip->mii_regval, fep->hwp + FEC_MII_DATA);
>  
>  unlock:
> -	spin_unlock_irq(&fep->mii_lock);
> +	spin_unlock(&fep->mii_lock);
>  }
>  
>  static int

-- 
------------------------------------------------------------------------
Greg Ungerer  --  Principal Engineer        EMAIL:     gerg@...pgear.com
SnapGear Group, McAfee                      PHONE:       +61 7 3435 2888
825 Stanley St,                             FAX:         +61 7 3891 3630
Woolloongabba, QLD, 4102, Australia         WEB: http://www.SnapGear.com
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