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

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Message-ID: <20120409190710.GA14176@kroah.com>
Date:	Mon, 9 Apr 2012 12:07:10 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	Heiko Carstens <heiko.carstens@...ibm.com>, 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 Mon, Apr 09, 2012 at 08:30:23PM +0200, Jiri Slaby wrote:
> On 04/09/2012 08:27 PM, Greg KH wrote:
> > On Tue, Apr 03, 2012 at 09:59:19AM +0200, Jiri Slaby wrote:
> >> 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.
> > 
> > Jiri, should I not apply this patch?
> 
> Yes, please skip it until this is sorted out. And also the other con3215
> patches if they don't apply cleanly now.

Ok, I've not applied patches 25, 26, and 27 in this series, but have
applied all others, thanks.

greg k-h
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