linux-kernel - Re: [PATCH] x86/PCI: initialize PCI bus node numbers early

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Date:	Tue, 1 Sep 2009 15:28:57 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	Jesse Brandeburg <jesse.brandeburg@...il.com>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH] x86/PCI: initialize PCI bus node numbers early

On Tue, 1 Sep 2009 15:53:58 +0200
Ingo Molnar <mingo@...e.hu> wrote:
>   acccaba: x86/PCI: initialize PCI bus node numbers early
> 
> caused a boot crash in -tip testing:
> 
> calling  amd_init+0x0/0x16 @ 1
> pata_amd 0000:00:06.0: version 0.4.1
> pata_amd 0000:00:06.0: setting latency timer to 64
> BUG: unable to handle kernel NULL pointer dereference at 00000e44

The 32 bit part looked a bit off, (unsigned char)-1 == 255.  Could
definitely cause issues ("any node" is supposed to be a real -1).

Can you give this patch a try?  (Note this code is a copy & paste of
the original AMD code, it could stand some cleanup.)

Thanks,
Jesse

diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index eb6eb61..ffcb516 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -640,7 +640,7 @@ int get_mp_bus_to_node(int busnum)
 
 #else /* CONFIG_X86_32 */
 
-static unsigned char mp_bus_to_node[BUS_NR] = {
+static int mp_bus_to_node[BUS_NR] = {
 	[0 ... BUS_NR - 1] = -1
 };
 
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