linux-kernel - Re: [PATCH 25/69] TTY: con3215, remove tasklet for tty

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Date:	Tue, 03 Apr 2012 09:59:19 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
CC:	gregkh@...uxfoundation.org, alan@...ux.intel.com,
	linux-kernel@...r.kernel.org, jirislaby@...il.com,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux390@...ibm.com, linux-s390@...r.kernel.org
Subject: Re: [PATCH 25/69] TTY: con3215, remove tasklet for tty_wakeup

On 04/03/2012 07:42 AM, Heiko Carstens wrote:
> On Mon, Apr 02, 2012 at 01:54:09PM +0200, Jiri Slaby wrote:
>> tty_wakeup is safe to be called from all contexts. No need to schedule
>> a tasklet for that. Let us call it directly like in other drivers.
>>
>> And delete the tasklet completely.
> 
> Your patch actually reverts Martin's recent commit 656d912537
> "[S390] 3215 deadlock with tty_wakeup".
> I'm quite sure the reason for the deadlock still exists.
> Unfortunately the commit doesn't contain the call chain that
> led to fix.

Ok, I would really appreciate the trace.

If this is really an issue, we should provide a helper in the TTY layer
like tty_schedule_wakeup.

thanks,
-- 
js
suse labs


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