linux-kernel - Re: [PATCH] libcxgbi: do not print a message when memory allocation fails

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Message-ID: <4EF8F4B5.6000900@cs.wisc.edu>
Date:	Mon, 26 Dec 2011 16:27:01 -0600
From:	Mike Christie <michaelc@...wisc.edu>
To:	Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
CC:	linux-scsi@...r.kernel.org, netdev@...r.kernel.org,
	kxie@...lsio.com, davem@...emloft.net, JBottomley@...allels.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] libcxgbi: do not print a message when memory allocation
 fails

On 12/14/2011 09:46 AM, Thadeu Lima de Souza Cascardo wrote:
> In alloc_pdu, libcxgbi tries to allocate a skb with GFP_ATOMIC, which
> may potentially fail. When it happens, the current code prints a warning
> message.
> 
> When the system is under IO stress, this failure may happen lots of
> times and it usually scares users.
> 
> Instead of printing the warning message, the code now increases the
> tx_dropped statistics for the ethernet interface wich is doing the iscsi
> task.
> 
> Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
> ---
>  drivers/scsi/cxgbi/libcxgbi.c |    5 +++--
>  1 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/cxgbi/libcxgbi.c b/drivers/scsi/cxgbi/libcxgbi.c
> index c10f74a..3422bc2 100644
> --- a/drivers/scsi/cxgbi/libcxgbi.c
> +++ b/drivers/scsi/cxgbi/libcxgbi.c
> @@ -1862,8 +1862,9 @@ int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
>  
>  	tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
>  	if (!tdata->skb) {
> -		pr_warn("alloc skb %u+%u, opcode 0x%x failed.\n",
> -			cdev->skb_tx_rsvd, headroom, opcode);
> +		struct cxgbi_sock *csk = cconn->cep->csk;
> +		struct net_device *ndev = cdev->ports[csk->port_id];
> +		ndev->stats.tx_dropped++;
>  		return -ENOMEM;
>  	}
>  

Looks ok to me.

Reviewed-by: Mike Christie <michaelc@...wisc.edu>
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