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From: Jiri Slaby <jirislaby@gmail.com>
To: Jiri Slaby <jslaby@suse.cz>,
	gregkh@suse.de, linux-serial@vger.kernel.org,
	linux-kernel@vger.kernel.org, Alan Cox <alan@linux.intel.com>,
	Arnd Bergmann <arnd@arndb.de>
Subject: Re: [PATCH v2 1/6] TTY: serial, remove BTM from wait_until_sent
Date: Wed, 10 Aug 2011 20:10:32 +0200	[thread overview]
Message-ID: <4E42C998.1050208@gmail.com> (raw)
In-Reply-To: <20110810180754.GB13832@bombe-desk.opditex>

On 08/10/2011 08:07 PM, Andreas Bombe wrote:
> On Wed, Aug 10, 2011 at 04:43:19PM +0200, Jiri Slaby wrote:
>> On 08/10/2011 03:09 AM, Andreas Bombe wrote:
>>> 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?
> 
> Nothing is connected. After all, the whole point of this exercise is to
> give the driver data to send which it can't get out so I can see whether
> it blocks all tty operations system wide while trying to do the flush on
> close.

But according to the trace, it waits only in its queue...

Well, could you turn on lockdep and dump sysrq-d when your echo is
closing the port?

thanks,
-- 
js

  reply	other threads:[~2011-08-10 18:10 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-07-14 12:35 [PATCH v2 1/6] TTY: serial, remove BTM from wait_until_sent Jiri Slaby
2011-07-14 12:35 ` [PATCH v2 2/6] TTY: msm_serial, remove unneeded console set Jiri Slaby
2011-07-14 12:35 ` [PATCH v2 3/6] TTY: serial, remove tasklet for tty_wakeup Jiri Slaby
2011-07-19 16:34   ` Alan Cox
2011-08-31 14:43     ` Jiri Slaby
2011-07-14 12:35 ` [PATCH v2 4/6] TTY: ami_serial, remove BTM from wait_until_sent Jiri Slaby
2011-07-14 12:35 ` [PATCH v2 5/6] TTY: remove tty_locked Jiri Slaby
2011-07-19 16:35   ` Alan Cox
2011-07-14 12:35 ` [PATCH v2 6/6] TTY: mxser+cyclades remove wait_until_sent debug code Jiri Slaby
2011-07-14 13:24 ` [PATCH v2 1/6] TTY: serial, remove BTM from wait_until_sent Arnd Bergmann
2011-07-19  0:35 ` Andreas Bombe
2011-08-08 13:21   ` Jiri Slaby
2011-08-10  1:09     ` Andreas Bombe
2011-08-10  9:46       ` Jiri Slaby
2011-08-10 12:25         ` Andreas Bombe
2011-08-10 14:43       ` Jiri Slaby
2011-08-10 18:07         ` Andreas Bombe
2011-08-10 18:10           ` Jiri Slaby [this message]
2011-08-11  1:06             ` Andreas Bombe

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