linux-kernel - Re: [PATCH 1/1] PCI: Handle case when no pci device can provide cache line size hint

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Message-ID: <20091216112209.4468ee53@jbarnes-piketon>
Date:	Wed, 16 Dec 2009 11:22:09 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Csaba Henk <csaba@...ster.com>
Cc:	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] PCI: Handle case when no pci device can provide
 cache line size hint

On Tue, 15 Dec 2009 17:55:25 +0530
Csaba Henk <csaba@...ster.com> wrote:

> Prior to this patch, if pci_read_config_byte(dev,
> PCI_CACHE_LINE_SIZE, ...) returns 0 for all dev, pci_cache_line_size
> ends up set to zero (instead of pci_dfl_cache_line_size).
> 
> This patch ensures the pci_cache_line_size = pci_dfl_cache_line_size
> setting in the above scenario.
> 
> This happens in case of a kvm-88 guest (where, consequently, the
> rtl8139 NIC failed to initialize).
> 
> Signed-off-by: Csaba Henk <csaba@...ster.com>
> ---
>  drivers/pci/quirks.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index 7cfa7c3..f70f4e2 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -2629,7 +2629,7 @@ static int __init pci_apply_final_quirks(void)
>  	if (!pci_cache_line_size) {
>  		printk(KERN_DEBUG "PCI: CLS %u bytes, default %u\n",
>  		       cls << 2, pci_dfl_cache_line_size << 2);
> -		pci_cache_line_size = cls;
> +		pci_cache_line_size = cls ? cls :
> pci_dfl_cache_line_size; }
>  
>  	return 0;

Applied, thanks.

-- 
Jesse Barnes, Intel Open Source Technology Center
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