linux-kernel - Re: [PATCH] PCI: Limit VPD length for Broadcom 5708S

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Message-ID: <4906CF96.2000809@cosmosbay.com>
Date:	Tue, 28 Oct 2008 09:38:46 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Yu Zhao <yu.zhao@...el.com>
CC:	benli@...adcom.com,
	"willy@...ux.intel.com" <willy@...ux.intel.com>,
	"jbarnes@...tuousgeek.org" <jbarnes@...tuousgeek.org>,
	linux kernel <linux-kernel@...r.kernel.org>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Michael Chan <mchan@...adcom.com>
Subject: Re: [PATCH] PCI: Limit VPD length for Broadcom 5708S

Yu Zhao a écrit :
> On Tue, Oct 28, 2008 at 02:21:19PM +0800, Eric Dumazet wrote:
>> Benjamin Li a écrit :
>>> Hi Eric,
>>>
>>> It looks like the same problem again: we are reading past a valid VPD
>>> address.
>>>
>>> After some initial debugging, it looks like dev->vpd is NULL when the
>>> Broadcom 5706C/5706S/5708C/570S/5709 quirk is called.  Because of this
>>> dev->vpd->len is never set to the proper length to limit the VPD reads.
>>> I will debug further to determine what has changed.
>>>
>>> Thanks again for pointing out the problem.
>>>
>> I did a git bisect this morning :
>>
>> $ git bisect good
>> 201de56eb22f1ff3f36804bc70cbff220b50f067 is first bad commit
>> commit 201de56eb22f1ff3f36804bc70cbff220b50f067
>> Author: Zhao, Yu <yu.zhao@...el.com>
>> Date:   Mon Oct 13 19:49:55 2008 +0800
>>
>>     PCI: centralize the capabilities code in probe.c
>>
>>     This patch centralizes the initialization and release functions of
>>     various PCI capabilities in probe.c, which makes the introduction
>>     of new capability support functions cleaner in the future.
>>
>>     Signed-off-by: Yu Zhao <yu.zhao@...el.com>
>>     Signed-off-by: Jesse Barnes <jbarnes@...tuousgeek.org>
>>
> 
> Yes, the VPD initialization code has been moved to a later stage that is
> after the pci_fixup_header. Can you please try following fix?
>

Yes, this patch corrects the problem, thanks Yu.

Tested-by: Eric Dumazet <dada1@...mosbay.com>
 
> Thanks,
> Yu
> 
> VPD quirks needs to be called after the capability is initialized. Since
> VPD initialization is move to after pci_fixup_header, VPD quirks should
> be done at pci_fixup_final stage correspondingly.
> 
> Signed-off-by: Yu Zhao <yu.zhao@...el.com>
> 
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index bbf66ea..5049a47 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -1692,24 +1692,24 @@ static void __devinit quirk_brcm_570x_limit_vpd(struct pci_dev *dev)
>  	}
>  }
>  
> -DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_BROADCOM,
> -			 PCI_DEVICE_ID_NX2_5706,
> -			 quirk_brcm_570x_limit_vpd);
> -DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_BROADCOM,
> -			 PCI_DEVICE_ID_NX2_5706S,
> -			 quirk_brcm_570x_limit_vpd);
> -DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_BROADCOM,
> -			 PCI_DEVICE_ID_NX2_5708,
> -			 quirk_brcm_570x_limit_vpd);
> -DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_BROADCOM,
> -			 PCI_DEVICE_ID_NX2_5708S,
> -			 quirk_brcm_570x_limit_vpd);
> -DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_BROADCOM,
> -			 PCI_DEVICE_ID_NX2_5709,
> -			 quirk_brcm_570x_limit_vpd);
> -DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_BROADCOM,
> -			 PCI_DEVICE_ID_NX2_5709S,
> -			 quirk_brcm_570x_limit_vpd);
> +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM,
> +			PCI_DEVICE_ID_NX2_5706,
> +			quirk_brcm_570x_limit_vpd);
> +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM,
> +			PCI_DEVICE_ID_NX2_5706S,
> +			quirk_brcm_570x_limit_vpd);
> +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM,
> +			PCI_DEVICE_ID_NX2_5708,
> +			quirk_brcm_570x_limit_vpd);
> +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM,
> +			PCI_DEVICE_ID_NX2_5708S,
> +			quirk_brcm_570x_limit_vpd);
> +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM,
> +			PCI_DEVICE_ID_NX2_5709,
> +			quirk_brcm_570x_limit_vpd);
> +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM,
> +			PCI_DEVICE_ID_NX2_5709S,
> +			quirk_brcm_570x_limit_vpd);
>  
>  #ifdef CONFIG_PCI_MSI
>  /* Some chipsets do not support MSI. We cannot easily rely on setting
> 
> 


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