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SubjectRe: [PATCH v2 1/6] TTY: serial, remove BTM from wait_until_sent
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?


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