linux-kernel - Re: [PATCH 1/2] usb-serial : fix the nousb oops

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Message-ID: <a8e1da0902050133n5cc5db62j4a48cd1ea32442b2@mail.gmail.com>
Date:	Thu, 5 Feb 2009 17:33:08 +0800
From:	Dave Young <hidave.darkstar@...il.com>
To:	Greg KH <greg@...ah.com>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] usb-serial : fix the nousb oops

On Thu, Feb 5, 2009 at 7:59 AM, Greg KH <greg@...ah.com> wrote:
> On Wed, Feb 04, 2009 at 09:10:20AM +0800, Dave Young wrote:
>> remove wgreathouse@...a.com in cc-list because this mail will be
>> rejected by the smva.com email server.
>>
>> On Wed, Feb 4, 2009 at 7:58 AM, Greg KH <greg@...ah.com> wrote:
>> > On Mon, Feb 02, 2009 at 09:43:04AM +0800, Dave Young wrote:
>> >> On Sun, Feb 1, 2009 at 11:51 PM, Greg KH <greg@...ah.com> wrote:
>> >> > On Sun, Feb 01, 2009 at 06:53:23PM +0800, Dave Young wrote:
>> >> >>
>> >> >> In case with "nousb" booting, serial drivers will trigger kernel oops.
>> >> >
>> >> > They will?  What is the oops message?
>> >>
>> >> Yes, they will, at lease I saw usb_serial/aircable/ftdi_sio oops. I
>> >> will manage to copy the oops message later.
>> >>
>> >> >
>> >> >> Here add usb_disabled() check in usb_serial_init and usb_serial_register
>> >> >
>> >> > This is odd, is it something new?  Why is usb-serial the only driver
>> >> > that needs such a thing?
>> >>
>> >> No, it is not new thing.  usb serial drivers normally call
>> >> usb_serial_register first, then usb_register, usb_register will fail
>> >> due to "nousb" checking, but usb_serial_register no.
>> >
>> > But as usb_register will fail, shouldn't they properly back out and no
>> > oopses happen?  This sounds like a simple fix to the drivers that are
>> > failing here, not changing the usb-serial core.
>>
>> Hi greg
>>
>> I think all usb serial drivers which call usb_serial_register will
>> oops, so IMHO usb core should be fixed.
>>
>> I think maybe you missed my another reply, copy the content here again.
>
> No, I got it.
>
> I'm more interested in why usb-serial is oopsing, as it should't be.
>
>> ---
>> hand copy part of the oops message:
>
> Can you take a picture of the oops?

Hi, I have no camera at hand, I will take the picture tomorrow.

>
> thanks,
>
> greg k-h
>



-- 
Regards
dave
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