linux-kernel - Re: [PATCH net] atl1c: Improve driver not to do order 4 GFP

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Date:	Thu, 03 Dec 2015 09:17:28 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Michal Hocko <mhocko@...nel.org>, davem@...emloft.net,
	Andrew Morton <akpm@...l.org>,
	kernel list <linux-kernel@...r.kernel.org>, jcliburn@...il.com,
	chris.snook@...il.com, netdev@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, linux-mm@...ck.org,
	nic-devel@...lcomm.com, ronangeles@...il.com, ebiederm@...ssion.com
Subject: Re: [PATCH net] atl1c: Improve driver not to do order 4 GFP_ATOMIC
 allocation

On Thu, 2015-12-03 at 16:59 +0100, Pavel Machek wrote:
> atl1c driver is doing order-4 allocation with GFP_ATOMIC
> priority. That often breaks  networking after resume. Switch to
> GFP_KERNEL. Still not ideal, but should be significantly better.
> 
> atl1c_setup_ring_resources() is called from .open() function, and
> already uses GFP_KERNEL, so this change is safe.
>     
> Signed-off-by: Pavel Machek <pavel@....cz>
> 
> diff --git a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
> index 2795d6d..afb71e0 100644
> --- a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
> +++ b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
> @@ -1016,10 +1016,10 @@ static int atl1c_setup_ring_resources(struct atl1c_adapter *adapter)
>  		sizeof(struct atl1c_recv_ret_status) * rx_desc_count +
>  		8 * 4;
>  
> -	ring_header->desc = pci_alloc_consistent(pdev, ring_header->size,
> -				&ring_header->dma);
> +	ring_header->desc = dma_alloc_coherent(&pdev->dev, ring_header->size,
> +					       &ring_header->dma, GFP_KERNEL);
>  	if (unlikely(!ring_header->desc)) {
> -		dev_err(&pdev->dev, "pci_alloc_consistend failed\n");
> +		dev_err(&pdev->dev, "could not get memory for DMA buffer\n");
>  		goto err_nomem;
>  	}
>  	memset(ring_header->desc, 0, ring_header->size);
> 
> 

So this memset() will really require a different patch to get removed ?

Sigh, not sure why I review patches.



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