linux-kernel - Re: [PATCH v2 1/6] TTY: serial, remove BTM from wait_until

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Message-ID: <4E429907.6080000@gmail.com>
Date:	Wed, 10 Aug 2011 16:43:19 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Andreas Bombe <aeb@...ian.org>
CC:	Jiri Slaby <jslaby@...e.cz>, gregkh@...e.de,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alan Cox <alan@...ux.intel.com>, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v2 1/6] TTY: serial, remove BTM from wait_until_sent

On 08/10/2011 03:09 AM, Andreas Bombe wrote:
> On Mon, Aug 08, 2011 at 03:21:22PM +0200, Jiri Slaby wrote:
>> On 07/19/2011 02:35 AM, Andreas Bombe wrote:
>>> On Thu, Jul 14, 2011 at 02:35:10PM +0200, Jiri Slaby wrote:
>>>> This should also fix the issue Andreas is seeing (BTM in comparison to
>>>> BKL doesn't have any hidden functionality like unlocking during
>>>> sleeping).
>>>
>>> I tested the patch series and it does not appear to make a difference
>>> for the internal (16550A) serial ports on my system. Also, I am still
>>> unclear on why it freezes the X display during the timeout period.
>>
>> Sorry for the delay. Could you attach output of sysrq-t when this
>> happens? I mean with a kernel patched by my patch.
> 
> I did my simple test on ttyS0 again: "stty -F /dev/ttyS0 crtscts" then
> "echo >/dev/ttyS0". I attached the gzipped sysrq-t list in case you need
> the complete output. This is just the process while it is trying to
> close the device (bash's internal echo):

Hmm, perhaps obvious question. What is the port connected with? And with
what cable? Is it null modem cable? Or at least with DTR-CTS connected?

thanks,
-- 
js
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