netdev - Re: [PATCH 1/3] net: lpc_eth: Replace WARN() trace with simple pr

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Message-ID: <1339403108.6001.1697.camel@edumazet-glaptop>
Date:	Mon, 11 Jun 2012 10:25:08 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Roland Stigge <stigge@...com.de>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kevin.wells@....com,
	srinivas.bakki@....com, aletes.xgr@...il.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/3] net: lpc_eth: Replace WARN() trace with simple
 pr_warn()

On Mon, 2012-06-11 at 10:03 +0200, Roland Stigge wrote:
> A WARN() trace indicating a "BUG!" was identified as a "normal" case in the
> xmit function in case all TX descriptors are occupied already. In this case,
> NETDEV_TX_BUSY is returned, nothing buggy at all.
> 
> Signed-off-by: Roland Stigge <stigge@...com.de>
> Tested-by: Alexandre Pereira da Silva <aletes.xgr@...il.com>
> 
> ---
>  drivers/net/ethernet/nxp/lpc_eth.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- linux-2.6.orig/drivers/net/ethernet/nxp/lpc_eth.c
> +++ linux-2.6/drivers/net/ethernet/nxp/lpc_eth.c
> @@ -1114,7 +1114,7 @@ static int lpc_eth_hard_start_xmit(struc
>  		   buffers */
>  		netif_stop_queue(ndev);
>  		spin_unlock_irq(&pldat->lock);
> -		WARN(1, "BUG! TX request when no free TX buffers!\n");
> +		pr_warn("Note: TX request when no free TX buffers.\n");
>  		return NETDEV_TX_BUSY;
>  	}
>  

Entering this path is a bug, don't hide it...

Please share with us how this bug was identified as a "normal case" ?



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