linux-kernel - Re: tty_lock held during transmit wait in close: still unresolved

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Message-ID: <20110527002928.GA4369@amos.fritz.box>
Date:	Fri, 27 May 2011 02:29:29 +0200
From:	Andreas Bombe <aeb@...ian.org>
To:	Greg KH <greg@...ah.com>
Cc:	linux-kernel@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: tty_lock held during transmit wait in close: still unresolved

On Thu, May 26, 2011 at 12:11:04AM -0700, Greg KH wrote:
> On Thu, May 26, 2011 at 01:59:22AM +0200, Andreas Bombe wrote:
> > A minimalist way to trigger this issue is with a serial port that has
> > nothing attached:
> > 
> > stty -F /dev/ttyS0 crtscts
> > echo >/dev/ttyS0
> > 
> > The echo triggers a 30 second timeout on close while the driver is
> > trying to flush the newline. Another way is developing an USB device
> > with a virtual serial port and having it stop (by debugger or
> > crash/lockup)...
> > 
> > Any ideas on how to progress?
> 
> Can you try Linus's tree right now?  A number of changes went in during
> this merge window that might help out here I think.

I think I had those changes already in the last try (Wednesday's git)
but I tried again with the very latest. No noticeable change.

-- 
Andreas Bombe
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