linux-kernel - Re: Oops when insmod rtl8192ce

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Date:	Wed, 27 Jul 2011 09:37:13 -0500
From:	Larry Finger <Larry.Finger@...inger.net>
To:	hubert Liao <liao.hubertt@...il.com>
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

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.

I would also like some additional information. What kernel are you using? In 
addition, please post the 'lspci -nnk' information for your card.

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?

Thanks,
Larry

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