linux-kernel - Re: [PATCH] Revert "leds: convert blink timer to workqueue"

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Message-ID: <alpine.LNX.2.00.1409022322330.12309@pobox.suse.cz>
Date:	Tue, 2 Sep 2014 23:22:55 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Bryan Wu <cooloney@...il.com>
cc:	Vincent Donnefort <vdonnefort@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, Tejun Heo <tj@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Revert "leds: convert blink timer to workqueue"

On Tue, 2 Sep 2014, Bryan Wu wrote:

> On Tue, Sep 2, 2014 at 2:03 AM, Jiri Kosina <jkosina@...e.cz> wrote:
> > This reverts commit 8b37e1bef5a6b60e949e28a4db3006e4b00bd758.
> >
> > It's broken as it changes led_blink_set() in a way that it can now sleep
> > (while synchronously waiting for workqueue to be cancelled). That's a
> > problem, because it's possible that this function gets called from atomic
> > context (tpt_trig_timer() takes a readlock and thus disables preemption).
> >
> > This has been brought up 3 weeks ago already [1] but no proper fix has
> > materialized, and I keep seeing the problem since 3.18-rc1.
> 
> Is this 3.18-rc1? I think it should be 3.17-rc1, right?

Indeed, brainfart on my side, thanks for noticing.

-- 
Jiri Kosina
SUSE Labs
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