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

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Message-ID: <20140327033724.GB13038@saruman.home>
Date:	Wed, 26 Mar 2014 22:37:24 -0500
From:	Felipe Balbi <balbi@...com>
To:	Peter Hurley <peter@...leysoftware.com>
CC:	<balbi@...com>, 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"

Hi,

On Wed, Mar 26, 2014 at 10:27:13PM -0400, Peter Hurley wrote:
> 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.

I wouldn't add that tag myself, but Murali (in Cc) did help testing
together with other colleagues.

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

touchè :-)

-- 
balbi

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