linux-kernel - [PATCH]: AMD Northbridge: Verify NB's node is online

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Date:	Thu, 12 Nov 2009 13:09:31 -0500
From:	Prarit Bhargava <prarit@...hat.com>
To:	linux-kernel@...r.kernel.org, bhavna.sarathy@....com,
	jbarnes@...tuousgeek.org, andreas.herrmann3@....com, mingo@...e.hu
Cc:	Prarit Bhargava <prarit@...hat.com>
Subject: [PATCH]: AMD Northbridge: Verify NB's node is online

Panic seen on some IBM and HP systems on 2.6.32-rc6.

BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<ffffffff8120bf3f>] find_next_bit+0x77/0x9c
PGD 2735ba067 PUD 2735d5067 PMD 0 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/platform/pcspkr/modalias
CPU 7 
Modules linked in: k8temp(+) pcspkr edac_core serio_raw hwmon shpchp cciss dm_snapshot dm_zero dm_mirror dm_region_hash dm_log dm_mod
Pid: 616, comm: modprobe Not tainted 2.6.32-rc6 #2 ProLiant DL585 G2   
RIP: 0010:[<ffffffff8120bf3f>]  [<ffffffff8120bf3f>] find_next_bit+0x77/0x9c
RSP: 0018:ffff8802736fdd18  EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffffffff8182f680 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000008
RBP: ffff8802736fdd18 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff81d922e0 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffffa007e720 R14: 0000000000000001 R15: 00000000015b19e0
FS:  00007f0a474086f0(0000) GS:ffff880036400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000000 CR3: 0000000273cbb000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process modprobe (pid: 616, threadinfo ffff8802736fc000, task ffff8802743b5c00)
Stack:
 ffff8802736fdd38 ffffffff8120bbde ffff88027646b0d8 ffff88027646b168
<0> ffff8802736fdd88 ffffffff81225c62 ffffffffa007e720 ffff88027646b0d8
<0> ffffffffa007e930 ffffffff812b9be6 ffff88027646b168 ffffffffa007e780
Call Trace:
 [<ffffffff8120bbde>] cpumask_next_and+0x2e/0x3b
 [<ffffffff81225c62>] pci_device_probe+0x8e/0xf5
 [<ffffffff812b9be6>] ? driver_sysfs_add+0x47/0x6c
 [<ffffffff812b9da5>] driver_probe_device+0xd9/0x1f9
 [<ffffffff812b9f1d>] __driver_attach+0x58/0x7c
 [<ffffffff812b9ec5>] ? __driver_attach+0x0/0x7c
 [<ffffffff812b9298>] bus_for_each_dev+0x54/0x89
 [<ffffffff812b9b4f>] driver_attach+0x19/0x1b
 [<ffffffff812b97ae>] bus_add_driver+0xd3/0x23d
 [<ffffffff812ba1e7>] driver_register+0x98/0x109
 [<ffffffff81225ed0>] __pci_register_driver+0x63/0xd3
 [<ffffffff81072776>] ? up_read+0x26/0x2a
 [<ffffffffa0081000>] ? k8temp_init+0x0/0x20 [k8temp]
 [<ffffffffa008101e>] k8temp_init+0x1e/0x20 [k8temp]
 [<ffffffff8100a073>] do_one_initcall+0x6d/0x185
 [<ffffffff8108d765>] sys_init_module+0xd3/0x236
 [<ffffffff81011ac2>] system_call_fastpath+0x16/0x1b
Code: 49 83 c0 40 eb 14 49 8b 01 48 85 c0 75 39 49 83 c1 08 49 83 c0 40 48 83 ef 40 48 f7 c7 c0 ff ff ff 75 e3 48 85 ff 4c 89 c0 74 23 <49> 8b 01 b9 40 00 00 00 48 83 ca ff 29 f9 48 d3 ea 48 21 d0 75 
RIP  [<ffffffff8120bf3f>] find_next_bit+0x77/0x9c
 RSP <ffff8802736fdd18>
CR2: 0000000000000000
---[ end trace a3d7e2941e8a6320 ]---

Hardware maybe programmed incorrectly and return a bogus node ID.  Check to
see if the node is actually online before setting the numa node for an AMD
northbridge in quirk_amd_nb_node().

Signed-off-by: Prarit Bhargava <prarit@...hat.com>

diff --git a/arch/x86/kernel/quirks.c b/arch/x86/kernel/quirks.c
index 6c3b2c6..9308ba7 100644
--- a/arch/x86/kernel/quirks.c
+++ b/arch/x86/kernel/quirks.c
@@ -507,7 +507,8 @@ static void __init quirk_amd_nb_node(struct pci_dev *dev)
 		return;
 
 	pci_read_config_dword(nb_ht, 0x60, &val);
-	set_dev_node(&dev->dev, val & 7);
+	if (node_online(val & 7))
+		set_dev_node(&dev->dev, val & 7);
 	pci_dev_put(nb_ht);
 }
 
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