linux-kernel - Re: [PATCH] kernel: async: Fixed the wrong waitting condition of wait

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Date:	Wed, 7 Jan 2015 16:39:15 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Chunyan Zhang <chunyan.zhang@...eadtrum.com>
Cc:	<ionut.m.alexa@...il.com>, <mark.yang@...eadtrum.com>,
	<wei.qiao@...eadtrum.com>, <geng.ren@...eadtrum.com>,
	<orson.zhai@...eadtrum.com>, <zhizhou.zhang@...eadtrum.com>,
	<ke.wang@...eadtrum.com>, <zhang.lyra@...il.com>,
	<linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH] kernel: async: Fixed the wrong waitting condition of
 wait_event

(resend with cc's, sorry)

On Mon, 5 Jan 2015 11:35:35 +0800 Chunyan Zhang <chunyan.zhang@...eadtrum.com> wrote:

> This patch changes the waitting condition of wait_event in the
> function 'async_synchronize_cookie_domain'.
> 
> This function waits until all asynchronous function calls for the certain
> domain have been done.
> 
> But, the function 'lowest_in_progress' returns the lowest *pending*
> entry's cookie.
> 
> So we should make sure that the return value of lowest_in_progress(domain)
> must be larger than @cookie.

I'm having runtime problems with this.  Twice the kernel silently hangs
late in initcalls and the third time I got a great stream of oopses.

I'll drop it.  Hopefully you'll be able to work through the bug with
Arjan and Tejun.

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