linux-kernel - Re: PROBLEM: Race condition in tty buffer's function flush_to

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Message-ID: <4EB7F0AE.4080600@ilyx.ru>
Date:	Mon, 07 Nov 2011 18:52:30 +0400
From:	Ilya Zykov <ilya@...x.ru>
To:	Alan Cox <alan@...ux.intel.com>
CC:	Greg Kroah-Hartman <gregkh@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: Race condition in tty buffer's function flush_to_ldisc().

Alan Cox wrote:

>> Of course I know about tty_buffer_flush(), it only read TTY_FLUSHING,
>> it can't change TTY_FLUSHING, if flush_to_ldisc() single threaded,
>> we can change TTY_FLUSHING only in one place in one time(in
>> flush_to_ldisc()), therefor we can use only "set_bit(TTY_FLUSHING,
>> &tty->flags)" without test.
> 
> Yes.. if you can pin down why in your testing you see the other case
> sometimes being true.
> 
> Alan
>  
> 
> 

OK, I try.
Ilya.
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