netdev - Re: [PATCH 2.6.31-rc4] gigaset: really fix chars_in

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Date:	Sat, 1 Aug 2009 17:11:41 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Tilman Schmidt <tilman@...p.cc>
Cc:	davem@...emloft.net, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, Alan Cox <alan@...ux.intel.com>,
	Hansjoerg Lipp <hjlipp@....de>
Subject: Re: [PATCH 2.6.31-rc4] gigaset: really fix chars_in_buffer

On Sat,  1 Aug 2009 14:18:51 +0200 (CEST)
Tilman Schmidt <tilman@...p.cc> wrote:

> This patch corrects the problem noted but left unfixed by commit
> 23198fda7182969b619613a555f8645fdc3dc334 "tty: fix chars_in_buffers".
> The tty_operation chars_in_buffer() should return zero, not a
> negative value, in the error case.

Is that correct. If you take a signal so the mutex_lock_interruptible
takes the error path we'll exit any waits for characters to be flushed
from buffers and lose the bytes in some cases ? Thats why I didn't
convert it - I didn't understand why it was using _interruptible at all ?

Alan
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