linux-kernel - Re: [Stable-review] [19/39] e100: Use pci pool to work around GFP

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Date:	Mon, 15 Mar 2010 15:25:51 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	David Miller <davem@...emloft.net>
Cc:	gregkh@...e.de, linux-kernel@...r.kernel.org, stable@...nel.org,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	roger.oksanen@...helsinki.fi
Subject: Re: [Stable-review] [19/39] e100: Use pci pool to work around
 GFP_ATOMIC order 5 memory allocation failure

On Mon, 15 Mar 2010 15:20:37 -0700 (PDT)
David Miller <davem@...emloft.net> wrote:

> From: David Miller <davem@...emloft.net>
> Date: Mon, 15 Mar 2010 14:39:06 -0700 (PDT)
> 
> > From: Stephen Hemminger <shemminger@...tta.com>
> > Date: Mon, 15 Mar 2010 14:36:53 -0700
> > 
> >> The kernel has both fixes in it. The customer reported that if both
> >> were reverted, the kernel panic went away.
> > 
> > Please recheck that as your backtrace matches exactly the
> > crash signature fixed by the memset().
> 
> As an update, after some auditing I found that ring parameter changes
> aren't handled correctly by the PCI pool changes and that might
> explain the crash.
> 
> I'll push the following fix around as soon as possible:
> 
> diff --git a/drivers/net/e100.c b/drivers/net/e100.c
> index a26ccab..b997e57 100644
> --- a/drivers/net/e100.c
> +++ b/drivers/net/e100.c
> @@ -2858,7 +2858,7 @@ static int __devinit e100_probe(struct pci_dev *pdev,
>  	}
>  	nic->cbs_pool = pci_pool_create(netdev->name,
>  			   nic->pdev,
> -			   nic->params.cbs.count * sizeof(struct cb),
> +			   nic->params.cbs.max * sizeof(struct cb),
>  			   sizeof(u32),
>  			   0);
>  	DPRINTK(PROBE, INFO, "addr 0x%llx, irq %d, MAC addr %pM\n",

I will cherry pick it back into our kernel for validation.
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