From: Jiri Slaby <jslaby@suse.cz>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>,
alan@linux.intel.com, linux-kernel@vger.kernel.org,
jirislaby@gmail.com, Martin Schwidefsky <schwidefsky@de.ibm.com>,
linux390@de.ibm.com, linux-s390@vger.kernel.org
Subject: Re: [PATCH 25/69] TTY: con3215, remove tasklet for tty_wakeup
Date: Mon, 09 Apr 2012 20:30:23 +0200 [thread overview]
Message-ID: <4F832ABF.4060509@suse.cz> (raw)
In-Reply-To: <20120409182720.GA12044@kroah.com>
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.
thanks,
--
js
suse labs
next prev parent reply other threads:[~2012-04-09 18:30 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1333367693-3244-1-git-send-email-jslaby@suse.cz>
2012-04-02 11:54 ` [PATCH 24/69] TTY: con3215, centralize allocation Jiri Slaby
2012-04-03 5:56 ` Heiko Carstens
2012-04-02 11:54 ` [PATCH 25/69] TTY: con3215, remove tasklet for tty_wakeup Jiri Slaby
2012-04-03 5:42 ` Heiko Carstens
2012-04-03 7:59 ` Jiri Slaby
2012-04-09 18:27 ` Greg KH
2012-04-09 18:30 ` Jiri Slaby [this message]
2012-04-09 19:07 ` Greg KH
2012-04-02 11:54 ` [PATCH 26/69] TTY: con3215, add tty_port Jiri Slaby
2012-04-02 11:54 ` [PATCH 27/69] TTY: con3215, use tty from tty_port Jiri Slaby
2012-04-02 11:54 ` [PATCH 28/69] TTY: sclp_tty, add tty_port Jiri Slaby
2012-04-02 11:54 ` [PATCH 29/69] TTY: sclp_vt220, " Jiri Slaby
2012-04-02 11:54 ` [PATCH 30/69] TTY: sclp_vt220, remove unused allocation Jiri Slaby
2012-04-02 11:54 ` [PATCH 31/69] TTY: tty3270, move initialization to allocation Jiri Slaby
2012-04-02 11:54 ` [PATCH 32/69] TTY: tty3270, get rid of ugly aliasing Jiri Slaby
2012-04-02 11:54 ` [PATCH 33/69] TTY: tty3270, push tty down to tty3270_do_write Jiri Slaby
2012-04-02 11:54 ` [PATCH 34/69] TTY: tty3270, add tty_port Jiri Slaby
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