linux-kernel - Re: Oops when insmod rtl8192ce

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Date:	Fri, 29 Jul 2011 09:21:35 +0800
From:	Hubert Liao <liao.hubertt@...il.com>
To:	Larry Finger <Larry.Finger@...inger.net>
Cc:	"John W. Linville" <linville@...driver.com>, wlanfae@...ltek.com,
	Chaoming Li <chaoming_li@...lsil.com.cn>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Oops when insmod rtl8192ce

2011/7/28 Larry Finger <Larry.Finger@...inger.net>:
> On 07/28/2011 02:06 AM, hubert Liao wrote:
>>
>> 2011/7/27 John W. Linville<linville@...driver.com>:
>>>
>>> On Wed, Jul 27, 2011 at 05:20:15PM +0800, 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?
>>>
>>> pdev is coming straight from what is passed to the PCI probe routine.
>>> It seems like pdev->bus->self should already be set before that
>>> happens.
>>>
>> Yes, I think it should be initialized when added the pci bus bridge,
>> I have checked the mach-kirkwood(my board is arch/arm/mach-kirkwood)
>> pcie related code, and I think when system initialized should call
>> kirkwood_pcie_init() ->
>>             kirkwood_pcie_scan_bus() ->
>>                            pci_scan_bus() ->
>>                                     pci_bus_add_devices()
>> if the pci_bus->self  was initialized in pci_bus_add_devices()?
>> Maybe the code is too complex for me ,  I really can not find where
>> set the “->self" member?
>
> I added a request to the bugzilla entry to post the full dmesg output there.
> Perhaps there is some clue in the bus setup.
>
I have added the full dmesg output on bugzilla.
thanks.
> Larry
>
>
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