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

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Message-ID: <CA+5PVA7oZVWAiVTyiRkW5H1jB7JTPLZv==upSm6FcPZyj8hV5A@mail.gmail.com>
Date:	Tue, 2 Sep 2014 11:55:31 -0400
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Vincent Donnefort <vdonnefort@...il.com>,
	Bryan Wu <cooloney@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, Tejun Heo <tj@...nel.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Revert "leds: convert blink timer to workqueue"

On Tue, Sep 2, 2014 at 5:03 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.
>
> [1] https://lkml.org/lkml/2014/8/16/128

FWIW we're seeing it reported in Fedora too.  Perhaps a revert is the
right approach for now.

josh
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