linux-kernel - Re: [PATCH 10/11] Revert "serial: omap: unlock the port lock"

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Message-ID: <53338C81.3060600@hurleysoftware.com>
Date:	Wed, 26 Mar 2014 22:27:13 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	balbi@...com
CC:	Tony Lindgren <tony@...mide.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	linux-serial@...r.kernel.org, linux-bluetooth@...r.kernel.org,
	m-karicheri2@...com, b32955@...escale.com,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 10/11] Revert "serial: omap: unlock the port lock"

On 03/26/2014 10:10 PM, Felipe Balbi wrote:
> Hi,
>
> On Wed, Mar 26, 2014 at 08:39:11PM -0400, Peter Hurley wrote:
>> On 03/25/2014 02:28 PM, Tony Lindgren wrote:
>>> * Felipe Balbi <balbi@...com> [140320 12:39]:
>>>> This reverts commit 0324a821029e1f54e7a7f8fed48693cfce42dc0e.
>>>>
>>>> That commit tried to fix a deadlock problem when using
>>>> hci_ldisc, but it turns out the bug was in hci_ldsic
>>>> all along where it was calling ->write() from within
>>>> ->write_wakeup() callback.
>>>>
>>>> The problem is that ->write_wakeup() was called with
>>>> port lock held and ->write() tried to grab the same
>>>> port lock.
>>>
>>> Should this and the next patch be earlier in the series
>>> as a fix for the v3.15-rc cycle? Should they be cc: stable
>>> as well?
>>
>> Well, right now the other fix has had _zero_ testing
>> so not really a -stable candidate just yet.
>
> how can you even say that ?

I misunderstood when you wrote:

On 03/20/2014 02:11 PM, Felipe Balbi wrote:
 > here's a build-tested only patch which is waiting for testing from other
 > colleagues who've got a platform to reproduce the problem:

and then the version I reviewed had no Tested-by: tags.

> Unless you work for some 3 letter acronym
> organizations, you have no clue about the fact that this was tested on a
> keystone 2 platform.

Ok.

> How else would we have found the issue to start with ?

Bug report?

Regards,
Peter Hurley

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