Re: [PATCH] [usb-serial] fix Ooops on uplug

[Alan Cox]

On Tue, 21 Jul 2009 12:11:39 -0400 (EDT)
Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:

> On Tue, 21 Jul 2009, Alan Cox wrote:
> 
> > > The problem is that freed resources are accessed, and that can lead to
> > > any kind of strange kernel faults from crashing to other subsequent
> > > errors.
> > > 
> > > Did you try my patch?
> 
> No.
> 
> > We've already established your patch is wrong. So trying it isn't at all
> > helpful.
> 
> I'll take your word for it.  It will take some time to figure out 
> exactly which buffers are getting used after they are freed, although 
> the most likely is the usb_serial_port structure itself.
> 
> Let you know what I find...

On the tty side if you look in tty_io.c there is a define

TTY_DEBUG_HANGUP

which exists especially for these sorts of events..

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