Return-path: Received: from mail-gw0-f46.google.com ([74.125.83.46]:57474 "EHLO mail-gw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753292Ab1G0OhS (ORCPT ); Wed, 27 Jul 2011 10:37:18 -0400 Message-ID: <4E302299.2070309@lwfinger.net> (sfid-20110727_163721_772187_D2BADD71) Date: Wed, 27 Jul 2011 09:37:13 -0500 From: Larry Finger MIME-Version: 1.0 To: hubert Liao CC: Chaoming Li , "John W. Linville" , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: Oops when insmod rtl8192ce References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Sender: linux-wireless-owner@vger.kernel.org List-ID: 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