Subject: Re: Fwd: NULL pointer dereference at netxen_nic_probe+0x813/0x9a0

From: Denis Kirjanov <[email-masked]>
Date: Fri, 29 Oct 2010 23:47:22 +0400

> This is on current Linus upstream as of this morning (8128057)
> on an HP DL785:
> 
> QLogic/NetXen Network Driver v4.0.74
> netxen_nic 0000:07:00.0: PCI INT A -> GSI 30 (level, low) -> IRQ 30
> netxen_nic 0000:07:00.0: setting latency timer to 64
> netxen_nic 0000:07:00.0: 2MB memory map
> netxen_nic 0000:07:00.0: loading firmware from flash
> netxen_nic 0000:07:00.0: using 64-bit dma mask
> kernel: Quad Gig LP Board S/N TI9ABK0266  Chip rev 0x42
> netxen_nic 0000:07:00.0: firmware v4.0.520 [legacy]
> netxen_nic 0000:07:00.0: irq 72 for MSI/MSI-X
> netxen_nic 0000:07:00.0: irq 73 for MSI/MSI-X
> netxen_nic 0000:07:00.0: irq 74 for MSI/MSI-X
> netxen_nic 0000:07:00.0: irq 75 for MSI/MSI-X
> netxen_nic 0000:07:00.0: using msi-x interrupts
> BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
> IP: [<ffffffff8160afda>] netxen_nic_probe+0x813/0x9a0
> PGD 0
> Oops: 0002 [#1] SMP
> last sysfs file:
> CPU 0
> Modules linked in:
> 
> Pid: 1650, comm: work_for_cpu Not tainted 2.6.36-07338-g8128057 #269
> /ProLiant DL785 G5
> RIP: 0010:[<ffffffff8160afda>]  [<ffffffff8160afda>]
> netxen_nic_probe+0x813/0x9a0
> RSP: 0018:ffff8806138abe30  EFLAGS: 00010246
> RAX: 0000000000000010 RBX: ffff8806139126c0 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: ffff880613895616 RDI: ffff880613912000
> RBP: ffff8806138abe90 R08: 0000000000000000 R09: ffff8806138abb80
> R10: 0000000000000000 R11: 0000000000000000 R12: ffff880613912000
> R13: ffff8812174f7000 R14: ffff880613912000 R15: ffff8812174f7000
> FS:  0000000000000000(0000) GS:ffff8800cfa00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 0000000000000010 CR3: 0000000001c07000 CR4: 00000000000006f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Process work_for_cpu (pid: 1650, threadinfo ffff8806138aa000, task
> ffff880616f12be0)
> Stack:
>  ffff8812174f7090 0000000000000246 ffff8806138abe90 ffff8812174f7000
>  00008806138abfd8 0000000000000282 68cd0025b30068cc ffff880c17439d30
>  ffff8812174f7090 ffff8812174f7000 ffff8812174f7208 0000000000000000
> Call Trace:
>  [<ffffffff81203696>] local_pci_probe+0x48/0x91
>  [<ffffffff81052bae>] ? do_work_for_cpu+0x0/0x26
>  [<ffffffff81052bc1>] do_work_for_cpu+0x13/0x26
>  [<ffffffff81052bae>] ? do_work_for_cpu+0x0/0x26
>  [<ffffffff81057a7b>] kthread+0x81/0x89
>  [<ffffffff81003854>] kernel_thread_helper+0x4/0x10
>  [<ffffffff810579fa>] ? kthread+0x0/0x89
>  [<ffffffff81003850>] ? kernel_thread_helper+0x0/0x10
> Code: 00 eb 15 49 8d bf 90 00 00 00 48 c7 c6 1b 2e aa 81 31 c0 e8 c0
> 4e cd ff 4c 89 f7 e8 d6 bb ee ff 49 8b 96 00 03 00 00 48 8d 42 10 <f0>
> 80 4a 10 01 4c 89 f7 e8 a3 7e ed ff 85 c0 41 89 c4 74 2a 49
> RIP  [<ffffffff8160afda>] netxen_nic_probe+0x813/0x9a0
>  RSP <ffff8806138abe30>
> CR2: 0000000000000010
> ---[ end trace 059c7071bbf8de1f ]---
Could you please try the following patch.  

diff --git a/drivers/net/netxen/netxen_nic_main.c b/drivers/net/netxen/netxen_nic_main.c
index 50820be..5766475 100644
--- a/drivers/net/netxen/netxen_nic_main.c
+++ b/drivers/net/netxen/netxen_nic_main.c
@@ -1239,15 +1239,15 @@ netxen_setup_netdev(struct netxen_adapter *adapter,
 	if (netxen_read_mac_addr(adapter))
 		dev_warn(&pdev->dev, "failed to read mac addr\n");
 
-	netif_carrier_off(netdev);
-	netif_stop_queue(netdev);
-
 	err = register_netdev(netdev);
 	if (err) {
 		dev_err(&pdev->dev, "failed to register net device\n");
 		return err;
 	}
 
+	netif_carrier_off(netdev);
+	netif_stop_queue(netdev);
+
 	return 0;
 }