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

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Message-ID: <20081028064411.GA7043@yzhao12-linux.sh.intel.com>
Date:	Tue, 28 Oct 2008 14:44:11 +0800
From:	Yu Zhao <yu.zhao@...el.com>
To:	Eric Dumazet <dada1@...mosbay.com>, benli@...adcom.com
Cc:	"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

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?

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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