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Date: Thu, 6 Nov 2008 20:30:09 +0800
From: "Cedric Vivier" <cedricv@...nux.com>
To: "Denis Joseph Barrow" <D.Barow@...ion.com>
Cc: "Linux USB kernel mailing list" <linux-usb@...r.kernel.org>,
"Linux netdev Mailing list" <netdev@...r.kernel.org>,
"Filip Aben" <f.aben@...ion.com>
Subject: Re: [Fwd: Re: Fwd: [PATCH] Cleanup hso rfkill error handling [was: 2.6.28-rc2 / hso driver oops]]
On Thu, Nov 6, 2008 at 8:07 PM, Denis Joseph Barrow <D.Barow@...ion.com> wrote:
> See if this patch fixes things up, I think it might,, I hope it applies cleanly
> & let the mailing lists know if the patch works
>
> If you don't like fixing this patch up try getting it off the mailing lists.
Applied the patch and... hso module can be loaded (and used) again! :)
So it seems to fix or at least workaround the problem.
I notice "net hso0: hso_create_rfkill - Failed to register rfkill"
though, not sure what it means.
Cheers,
> -------- Original Message --------
> Subject: Re: Fwd: [PATCH] Cleanup hso rfkill error handling [was: 2.6.28-rc2 / hso driver oops]
> Date: Thu, 30 Oct 2008 11:14:16 +0000
> From: Andrew Bird (Sphere Systems) <ajb@...eresystems.co.uk>
> Organization: Sphere Systems Ltd
> To: Denis Joseph Barrow <D.Barow@...ion.com>
> References: <200810301034.13105.ajb@...eresystems.co.uk> <4909934B.90709@...ion.com>
>
> Hi Denis,
> Well I think you need to submit a patch to the /MAINTAINERS file adding a
> subsection for HSO with person name & email address. It probably should be
> sent via Greg Kroah-Hatman. At the very least get an author/copyright
> notice/date added to the top of hso.c too. Getting added as a maintainer
> should help your patch inclusion efforts too.
>
>
> Best regards,
>
>
> Andrew
>
>
> On Thursday 30 October 2008, Denis Joseph Barrow wrote:
>> Hi Andrew,
>> I consider myself as a maintainer of the hso driver, not the only one
>> though. How do I officially become a maintainer?
>> I'm concentrating on developing a new troublesome modem driver at the
>> moment & won't get a chance to active again on hso driver for at a month or
>> two. I'm a bad juggler so it would be good if someone else concentrated on
>> fixes to hso other than me for the moment.
>> I have posted at least 4 patches to the linux usb & linux netdev
>> mailing list & they weren't accepted yet & I need to
>> respin them for the latest kernels.
>>
>> Andrew Bird (Sphere Systems) wrote:
>> > Hi Denis,
>> > I don't know whether you are still working on the hso driver, but if so
>> > this may interest you. You might also want to add yourself as maintainer
>> > for the driver, quite a few of these things get cc'd to me in the absence
>> > of a formal maintainer, but I'm no longer working on the project.
>> >
>> >
>> > Best regards,
>> >
>> >
>> > Andrew
>> >
>> >
>> > ------------------------------------------------------------------------
>> >
>> > Subject:
>> > [PATCH] Cleanup hso rfkill error handling [was: 2.6.28-rc2 / hso driver
>> > oops]
>> > From:
>> > Jonathan McDowell <noodles@...th.li>
>> > Date:
>> > Thu, 30 Oct 2008 10:27:46 +0000
>> > To:
>> > linux-kernel@...r.kernel.org, netdev@...r.kernel.org
>> >
>> > To:
>> > linux-kernel@...r.kernel.org, netdev@...r.kernel.org
>> > CC:
>> > Greg Kroah-Hartman <gregkh@...e.de>, Andrew Bird
>> > <ajb@...eresystems.co.uk>
>> >
>> > On Wed, Oct 29, 2008 at 07:40:11PM +0000, Ben Hutchings wrote:
>> >> On Wed, 2008-10-29 at 16:40 +0000, Jonathan McDowell wrote:
>> >>> Hi.
>> >>>
>> >>> Tried out 2.6.28-rc2 today on my EEE 901 and my Option Icon 225 and got
>> >>> the following oops:
>> >>>
>> >>> hso: drivers/net/usb/hso.c: 1.2 Option Wireless
>> >>> usbcore: registered new interface driver hso
>> >>> usb 2-2: new full speed USB device using uhci_hcd and address 3
>> >>> usb 2-2: configuration #1 chosen from 1 choice
>> >>> hso0: Disabled Privacy Extensions
>> >>> BUG: unable to handle kernel NULL pointer dereference at 000000d0
>> >>> IP: [<c03589b9>] dev_driver_string+0x1/0x2a
>> >>
>> >> Something passed a null device pointer to dev_printk().
>> >>
>> >> [...]
>> >>
>> >>> [<f81b8265>] ? hso_create_net_device+0x305/0x32d [hso]
>> >>
>> >> [...]
>> >>
>> >> I think that hso_create_rfkill() is the culprit here (and has been
>> >> inlined into hso_create_net_device()). It's using hso_dev->dev as the
>> >> first argument to dev_err() and it doesn't look like that field is
>> >> initialised except by kzalloc. At a guess, it should be using
>> >> &hso_dev->usb->dev.
>> >
>> > Yup, this appears to be the problem, thanks. I think &hso_net->net->dev
>> > is more intuitive for the error message, so I've used that. I've also
>> > added missing line endings on the error messages and set our local
>> > rfkill structure element to NULL on failure so we don't try to call
>> > rfkill_unregister on driver removal if we failed to register at all.
>> >
>> > The patch below Works For Me (TM); the device is detected fine, can be
>> > removed without problems and connects ok. I'll have a prod at why the
>> > rfkill stuff isn't working next, but I believe this cleanup of the error
>> > handling is appropriate no matter what the issue with registration is.
>> >
>> > Signed-Off-By: Jonathan McDowell <noodles@...th.li>
>> >
>> > -----
>> > diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
>> > index 1164c52..9d9622b 100644
>> > --- a/drivers/net/usb/hso.c
>> > +++ b/drivers/net/usb/hso.c
>> > @@ -2184,19 +2184,20 @@ static void hso_create_rfkill(struct hso_device
>> > *hso_dev, struct usb_interface *interface)
>> > {
>> > struct hso_net *hso_net = dev2net(hso_dev);
>> > - struct device *dev = hso_dev->dev;
>> > + struct device *dev = &hso_net->net->dev;
>> > char *rfkn;
>> >
>> > hso_net->rfkill = rfkill_allocate(&interface_to_usbdev(interface)->dev,
>> > RFKILL_TYPE_WLAN);
>> > if (!hso_net->rfkill) {
>> > - dev_err(dev, "%s - Out of memory", __func__);
>> > + dev_err(dev, "%s - Out of memory\n", __func__);
>> > return;
>> > }
>> > rfkn = kzalloc(20, GFP_KERNEL);
>> > if (!rfkn) {
>> > rfkill_free(hso_net->rfkill);
>> > - dev_err(dev, "%s - Out of memory", __func__);
>> > + hso_net->rfkill = NULL;
>> > + dev_err(dev, "%s - Out of memory\n", __func__);
>> > return;
>> > }
>> > snprintf(rfkn, 20, "hso-%d",
>> > @@ -2209,7 +2210,8 @@ static void hso_create_rfkill(struct hso_device
>> > *hso_dev, kfree(rfkn);
>> > hso_net->rfkill->name = NULL;
>> > rfkill_free(hso_net->rfkill);
>> > - dev_err(dev, "%s - Failed to register rfkill", __func__);
>> > + hso_net->rfkill = NULL;
>> > + dev_err(dev, "%s - Failed to register rfkill\n", __func__);
>> > return;
>> > }
>> > }
>> > -----
>> >
>> > J.
>
>
> --
> best regards,
> D.J. Barrow
>
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