linux-kernel - Re: [PATCH v2] iwlwifi: pcie: move rx workqueue initialization to iwl_trans_pcie

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Date:   Tue, 29 Aug 2017 11:19:04 +0300
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Luca Coelho <luca@...lho.fi>
Cc:     Jiri Kosina <jikos@...nel.org>, linux-wireless@...r.kernel.org,
        linux-kernel@...r.kernel.org, linuxwifi@...el.com,
        rui.zhang@...el.com, edubezval@...il.com, linux-pm@...r.kernel.org,
        david.weinehall@...el.com, johannes.berg@...el.com,
        sara.sharon@...el.com, emmanuel.grumbach@...el.com
Subject: Re: [PATCH v2] iwlwifi: pcie: move rx workqueue initialization to iwl_trans_pcie_alloc()

Luca Coelho <luca@...lho.fi> writes:

> On Thu, 2017-08-24 at 21:56 +0200, Jiri Kosina wrote:
>> On Thu, 24 Aug 2017, Luca Coelho wrote:
>> 
>> > > Work queues cannot be allocated when a mutex is held because the mutex
>> > > may be in use and that would make it sleep.  Doing so generates the
>> > > following splat with 4.13+:
>> > > 
>> > > [   19.513298] ======================================================
>> > > [   19.513429] WARNING: possible circular locking dependency detected
>> > > [   19.513557] 4.13.0-rc5+ #6 Not tainted
>> > > [   19.513638] ------------------------------------------------------
>> > > [   19.513767] cpuhp/0/12 is trying to acquire lock:
>> > > [ 19.513867] (&tz->lock){+.+.+.}, at: [<ffffffff924afebb>]
>> > > thermal_zone_get_temp+0x5b/0xb0
>> > > [   19.514047]
>> > > [   19.514047] but task is already holding lock:
>> > > [ 19.514166] (cpuhp_state){+.+.+.}, at: [<ffffffff91cc4baa>]
>> > > cpuhp_thread_fun+0x3a/0x210
>> > > [   19.514338]
>> > > [   19.514338] which lock already depends on the new lock.
>> > > 
>> > > This lock dependency already existed with previous kernel versions,
>> > > but it was not detected until commit 49dfe2a67797 ("cpuhotplug: Link
>> > > lock stacks for hotplug callbacks") was introduced.
>> > > 
>> > > Reported-by: David Weinehall <david.weinehall@...el.com>
>> > > Reported-by: Jiri Kosina <jikos@...nel.org>
>> > > Signed-off-by: Luca Coelho <luciano.coelho@...el.com>
>> > 
>> > Jiri, did you have a chance to try this out? I'm about to ask Kalle to
>> > merge this so it gets in in time for 4.13-rc7.
>> 
>> Sorry, I am almost completely offline for one more week (vacation), and 
>> will not have access to the affected system before that.
>
> Sounds good! Enjoy! ;)
>
>
>>  But this indeed 
>> looks like a correct fix to me, so feel free to add
>> 
>> 	Acked-by: Jiri Kosina <jkosina@...e.cz>
>> 
>> I'll be able to provide my Tested-by: eventually only in ~10 days.
>
>
> Kalle already picked it up in wireless-drivers and this should make it's
> way to 4.13-rc7 (we hope).

It (10a54d8196d1) didn't make it to -rc7 but it's in net tree now and
should make it to the next release on Sunday (either -rc8 or the final).

-- 
Kalle Valo