From: Tejun Heo <tj@kernel.org>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: Ben Greear <greearb@candelatech.com>, linux-wireless@vger.kernel.org
Subject: Re: [PATCH] mac80211: Fix deadlock in ieee80211_do_stop.
Date: Thu, 18 Nov 2010 07:34:05 +0100 [thread overview]
Message-ID: <4CE4C8DD.6010806@kernel.org> (raw)
In-Reply-To: <1290020005.3777.6.camel@jlt3.sipsolutions.net>
Hello,
On 11/17/2010 07:53 PM, Johannes Berg wrote:
>> WQ_NON_REENTRANT doesn't guarantee ordered execution but it guarantees
>> that a single work is not executed concurrently on multiple CPUs. I'm
>> not sure whether this would be safe for the workqueue used by mac80211
>> but it should let us know whether the workqueue is choked due to a
>> work which is executing for long time. In the long run, if using non
>> reentrant is safe for mac80211, using it would be much better.
>
> No, I don't think it's safe for mac80211.
I see. In the longer run tho, it would be much better to convert to
NRT workqueue. The behavior would be more robust with much lower
latencies.
Thanks.
--
tejun
next prev parent reply other threads:[~2010-11-18 6:34 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-12 20:07 [PATCH] mac80211: Fix deadlock in ieee80211_do_stop greearb
2010-11-12 20:08 ` Luis R. Rodriguez
2010-11-12 20:16 ` Ben Greear
2010-11-12 20:49 ` Johannes Berg
2010-11-12 20:57 ` Ben Greear
2010-11-12 21:08 ` Johannes Berg
2010-11-12 21:51 ` Ben Greear
2010-11-13 10:34 ` Tejun Heo
2010-11-15 21:16 ` Ben Greear
2010-11-16 14:19 ` Tejun Heo
2010-11-16 16:51 ` Ben Greear
2010-11-17 8:55 ` Tejun Heo
2010-11-17 17:37 ` Ben Greear
2010-11-16 17:40 ` Johannes Berg
2010-11-17 8:47 ` Tejun Heo
2010-11-17 18:53 ` Johannes Berg
2010-11-17 18:59 ` Ben Greear
2010-11-17 19:03 ` Johannes Berg
2010-11-18 6:34 ` Tejun Heo [this message]
2010-11-18 7:07 ` Johannes Berg
2010-11-18 7:22 ` Tejun Heo
2010-11-18 16:59 ` Johannes Berg
2010-11-19 14:34 ` Tejun Heo
2010-11-19 17:57 ` Johannes Berg
2010-11-19 20:55 ` Ben Greear
2010-11-19 22:27 ` Luis R. Rodriguez
2010-12-08 17:36 ` Ben Greear
2010-12-08 18:19 ` Ben Greear
2010-12-08 18:28 ` Ben Greear
2010-12-09 14:34 ` Tejun Heo
2010-12-09 14:42 ` Johannes Berg
2010-12-09 14:46 ` Tejun Heo
2010-12-09 16:17 ` Tejun Heo
[not found] ` <4D0156F6.4000306@candelate ch.com>
2010-12-09 17:27 ` Ben Greear
2010-12-09 22:23 ` Ben Greear
2010-12-10 15:11 ` Tejun Heo
2010-12-10 16:35 ` Ben Greear
2010-11-18 17:55 ` Ben Greear
2010-11-18 18:04 ` Tejun Heo
2010-11-18 18:11 ` Ben Greear
2010-11-17 20:13 ` Ben Greear
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