netdev - Re: [PATCH] iscsi: Use GFP_ATOMIC in iscsi_offload

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Message-ID: <4A70FA22.7010706@cs.wisc.edu>
Date:	Wed, 29 Jul 2009 20:40:50 -0500
From:	Mike Christie <michaelc@...wisc.edu>
To:	open-iscsi@...glegroups.com
CC:	"davem@...emloft.net" <davem@...emloft.net>,
	"James.Bottomley@...senPartnership.com" 
	<James.Bottomley@...senPartnership.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH] iscsi: Use GFP_ATOMIC in iscsi_offload_mesg().

On 07/29/2009 01:49 PM, Michael Chan wrote:
> Changing to GFP_ATOMIC because the only caller in cnic/bnx2i may
> be calling this function while holding spin_lock.
>
> This problem was discovered by Mike Christie.
>
> Signed-off-by: Michael Chan<mchan@...adcom.com>
> ---
>   drivers/scsi/scsi_transport_iscsi.c |    4 ++--
>   1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
> index 783e33c..b47240c 100644
> --- a/drivers/scsi/scsi_transport_iscsi.c
> +++ b/drivers/scsi/scsi_transport_iscsi.c
> @@ -990,7 +990,7 @@ int iscsi_offload_mesg(struct Scsi_Host *shost,
>   	struct iscsi_uevent *ev;
>   	int len = NLMSG_SPACE(sizeof(*ev) + data_size);
>
> -	skb = alloc_skb(len, GFP_NOIO);
> +	skb = alloc_skb(len, GFP_ATOMIC);
>   	if (!skb) {
>   		printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
>   		return -ENOMEM;
> @@ -1012,7 +1012,7 @@ int iscsi_offload_mesg(struct Scsi_Host *shost,
>
>   	memcpy((char *)ev + sizeof(*ev), data, data_size);
>
> -	return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_NOIO);
> +	return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
>   }
>   EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
>

Using GFP_NOIO and changing the locking is my preference normally,  but 
if the locking changes are going to be a problem, then this is ok with 
me since we can fail allocations in other parts of the code.

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

Dave Miller probably wants to take this in his tree since it fixes a bug 
with this patch
http://git.kernel.org/?p=linux/kernel/git/davem/net-2.6.git;a=commit;h=6d7760a88c25057c2c2243e5dfe2d731064bd31d
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