linux-kernel - Re: Race condition in TTY ldisc layer in 2.6.33

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Message-ID: <20100311155015.GA25607@rere.qmqm.pl>
Date:	Thu, 11 Mar 2010 16:50:15 +0100
From:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:	Greg KH <greg@...ah.com>
Cc:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: Race condition in TTY ldisc layer in 2.6.33

On Thu, Mar 11, 2010 at 05:50:09AM -0800, Greg KH wrote:
> On Thu, Mar 11, 2010 at 02:32:22PM +0100, Micha? Miros?aw wrote:
> > Looks like there's some race contition in switching ldiscs on USB serial
> > ports. The following warnings trigger sometimes after killing and restarting
> > process that changes ldisc and waits forever. In case you want to look at
> > the code, there it is: http://rere.qmqm.pl/~mirq/sermmc/
> If you apply git commit 638b9648ab51c9c549ff5735d3de519ef6199df3 to the
> 2.6.33 kernel, does it solve the issue for you?

I'm running with the patch now. After couple cycles of starting and killing
the ldisc-setting process I get no warnings. I'll get back to you when/if
I encounter them again.

Best Regards,
Michał Mirosław
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