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From: Paul Mackerras <paulus@samba.org>
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Date: Wed, 2 Oct 2002 09:20:16 +1000 (EST)
To: Greg KH <greg@kroah.com>
Cc: Martin Diehl <lists@mdiehl.de>, linux-kernel@vger.kernel.org
Subject: Re: calling context when writing to tty_driver
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Greg KH writes:

> On Tue, Oct 01, 2002 at 12:37:42PM +0200, Martin Diehl wrote:
> > 
> > Hi,
> > 
> > just hitting another "sleeping on semaphore from illegal context" issue
> > with 2.5.39. Happened on down() in either usbserial->write_room() or
> > usbserial->write(), when invoked from bh context.
> 
> Can you send me the whole backtrace?  I'm curious as to who is calling
> those functions from bh context.

PPP will do that.

Paul.
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