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

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Message-ID: <20090204235949.GA300@kroah.com>
Date:	Wed, 4 Feb 2009 15:59:49 -0800
From:	Greg KH <greg@...ah.com>
To:	Dave Young <hidave.darkstar@...il.com>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] usb-serial : fix the nousb oops

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?

thanks,

greg k-h
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