All of lore.kernel.org
 help / color / mirror / Atom feed
From: Larry Finger <Larry.Finger@lwfinger.net>
To: hubert Liao <liao.hubertt@gmail.com>
Cc: Chaoming Li <chaoming_li@realsil.com.cn>,
	"John W. Linville" <linville@tuxdriver.com>,
	linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: Oops when insmod rtl8192ce
Date: Wed, 27 Jul 2011 09:37:13 -0500	[thread overview]
Message-ID: <4E302299.2070309@lwfinger.net> (raw)
In-Reply-To: <CAMzZzFGpDiFAhsLAb+SQxjbGMzBoOStF_Lr7Eb3PT6Drcf=VdA@mail.gmail.com>

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


WARNING: multiple messages have this Message-ID (diff)
From: Larry Finger <Larry.Finger-tQ5ms3gMjBLk1uMJSBkQmQ@public.gmane.org>
To: hubert Liao <liao.hubertt-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Chaoming Li <chaoming_li-kXabqFNEczNtrwSWzY7KCg@public.gmane.org>,
	"John W. Linville"
	<linville-2XuSBdqkA4R54TAoqtyWWQ@public.gmane.org>,
	linux-wireless-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: Oops when insmod rtl8192ce
Date: Wed, 27 Jul 2011 09:37:13 -0500	[thread overview]
Message-ID: <4E302299.2070309@lwfinger.net> (raw)
In-Reply-To: <CAMzZzFGpDiFAhsLAb+SQxjbGMzBoOStF_Lr7Eb3PT6Drcf=VdA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

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

--
To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

  reply	other threads:[~2011-07-27 14:37 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CAMzZzFGqPv6Nbw8J8JGNKcLA76sAs3oD6+hH9NPCjwA33fYpOQ@mail.gmail.com>
2011-07-27  9:26 ` Oops when insmod rtl8192ce hubert Liao
2011-07-27  9:26   ` hubert Liao
2011-07-27 14:37   ` Larry Finger [this message]
2011-07-27 14:37     ` Larry Finger
2011-07-28  1:21     ` hubert Liao
2011-07-28  1:21       ` hubert Liao
2011-07-27 13:53 ` John W. Linville
2011-07-27 13:53   ` John W. Linville
2011-07-28  7:06   ` hubert Liao
2011-07-28 14:56     ` Larry Finger
2011-07-29  1:21       ` Hubert Liao

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=4E302299.2070309@lwfinger.net \
    --to=larry.finger@lwfinger.net \
    --cc=chaoming_li@realsil.com.cn \
    --cc=liao.hubertt@gmail.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-wireless@vger.kernel.org \
    --cc=linville@tuxdriver.com \
    --cc=netdev@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.