linux-kernel - Re: [GIT]: Networking

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Message-ID: <20090406183324.6997e70d@hobbes>
Date:	Mon, 6 Apr 2009 18:33:24 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	David Miller <davem@...emloft.net>, akpm@...ux-foundation.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [GIT]: Networking

On Mon, 6 Apr 2009 18:25:31 -0700 (PDT)
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> 
> 
> The sky2 driver is buggered (by the previous pull, I presume). Some
> PCI interaction. NULL pointer dereference at boot.

Hopefully fixed by this patch in my for-linus branch?

-- 
Jesse Barnes, Intel Open Source Technology Center

commit d6141668c24d7d75c3486499c05a6b382cbc2bbe
Author: Anton Vorontsov <avorontsov@...mvista.com>
Date:   Wed Apr 1 02:23:41 2009 +0400

    PCI: Fix oops in pci_vpd_truncate
    
    pci_vpd_truncate() should check for dev->vpd->attr, otherwise
    this might happen:
    
    sky2 driver version 1.22
    Unable to handle kernel paging request for data at address 0x0000000c
    Faulting instruction address: 0xc01836fc
    Oops: Kernel access of bad area, sig: 11 [#1]
    [...]
    NIP [c01836fc] pci_vpd_truncate+0x38/0x40
    LR [c029be18] sky2_probe+0x14c/0x518
    Call Trace:
    [ef82bde0] [c029bda4] sky2_probe+0xd8/0x518 (unreliable)
    [ef82be20] [c018a11c] local_pci_probe+0x24/0x34
    [ef82be30] [c018a14c] pci_call_probe+0x20/0x30
    [ef82be50] [c018a330] __pci_device_probe+0x64/0x78
    [ef82be60] [c018a44c] pci_device_probe+0x30/0x58
    [ef82be80] [c01aa270] really_probe+0x78/0x1a0
    [ef82bea0] [c01aa460] __driver_attach+0xa4/0xa8
    [ef82bec0] [c01a96ac] bus_for_each_dev+0x60/0x9c
    [ef82bef0] [c01aa0b4] driver_attach+0x24/0x34
    [ef82bf00] [c01a9e08] bus_add_driver+0x12c/0x1cc
    [ef82bf20] [c01aa87c] driver_register+0x6c/0x110
    [ef82bf30] [c018a770] __pci_register_driver+0x4c/0x9c
    [ef82bf50] [c03782c8] sky2_init_module+0x30/0x40
    [ef82bf60] [c0001dbc] do_one_initcall+0x34/0x1a0
    [ef82bfd0] [c0362240] do_initcalls+0x38/0x58
    
    This happens with CONFIG_SKY2=y, and "ip=on" kernel command line, so
    pci_vpd_truncate() is called before late_initcall(pci_sysfs_init),
    therefore ->attr isn't yet initialized.
    
    Acked-by: Stephen Hemminger <shemminger@...tta.com>
    Signed-off-by: Anton Vorontsov <avorontsov@...mvista.com>
    Signed-off-by: Jesse Barnes <jbarnes@...tuousgeek.org>

diff --git a/drivers/pci/access.c b/drivers/pci/access.c
index 3814447..64dd7df 100644
--- a/drivers/pci/access.c
+++ b/drivers/pci/access.c
@@ -356,7 +356,8 @@ int pci_vpd_truncate(struct pci_dev *dev, size_t size)
 		return -EINVAL;
 
 	dev->vpd->len = size;
-	dev->vpd->attr->size = size;
+	if (dev->vpd->attr)
+		dev->vpd->attr->size = size;
 
 	return 0;
 }
--
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