linux-kernel - Re: Oops when insmod rtl8192ce

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Date:	Thu, 28 Jul 2011 09:21:23 +0800
From:	hubert Liao <liao.hubertt@...il.com>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	Chaoming Li <chaoming_li@...lsil.com.cn>,
	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Oops when insmod rtl8192ce

2011/7/27 Larry Finger <Larry.Finger@...inger.net>:
> On 07/27/2011 04:26 AM, hubert Liao wrote:
>>
>> Hi,
>> We got an oops when insmod rtl8192ce module (the board is an ARM soc),
>> accroding the oops message, find it's because in rtl_pci_probe()
>> called _rtl_pci_find_adapter(),
>> in this funcation, the  pdev->bus->self is a NULL pointer .
>> static boot _rtl_pci_find_adapter(strcut pci_dev *dev,
>>               struct ieee80211_hw *hw)
>> {
>> struct pci_dev *bridge_pdev = pdev->bus->self;   //line 1601
>> ...
>> pcipriv->ndis_adapter.pcibridge_vendorid = bridge_pdev->vendor;<--
>> [oops here] line 1700
>> ...
>> }
>> here, I just want to know why the bus->self  is NULL?
>> ----
>> [  148.186632] Unable to handle kernel NULL pointer dereference at
>> virtual address 00000020
>
> As John Linville suggested, please open a bugzilla report.
>
Ok, I'll try it, but I am not familiar with it.
> I would also like some additional information. What kernel are you using? In
> addition, please post the 'lspci -nnk' information for your card.
>
The kernel is from the latest linus kernel git tree(3.0.0-05684-ge371d46-dirty),
I also have tested the 2.6.38.8 stable release, it has the same problem.

lspci -nnk
00:00.0 Class [0580]: Device [11ab:6192] (rev 03)
        Subsystem: Device [11ab:11ab]
00:01.0 Class [0280]: Device [10ec:8178] (rev 01)
        Subsystem: Device [1a3b:1178]

> I also think that pdev->bus should have been setup before the initialization
> code in rtl8192ce was called. I have not tested the driver on other than x86
> and x86_64 architectures because of hardware availability, thus ARM may
> expose some problems. Is this soc little-endian?
>
Yes ,it is little-endian

cat /proc/cpuinfo
Processor       : Feroceon 88FR131 rev 1 (v5l)
BogoMIPS        : 789.70
Features        : swp half thumb fastmult edsp
CPU implementer : 0x56
CPU architecture: 5TE
CPU variant     : 0x2
CPU part        : 0x131
CPU revision    : 1

Hardware        : Marvell RD-88F6192-NAS Development Board
Revision        : 0000
Serial          : 0000000000000000

> Thanks,
> Larry
>
>
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