linux-kernel - Re: [PATCH] Bluetooth: Revert "Bluetooth: rfcomm: Remove unnecessary krfcommd event"

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Date:	Wed, 29 Oct 2014 22:06:17 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Sasha Levin <sasha.levin@...cle.com>, marcel@...tmann.org,
	gustavo@...ovan.org, johan.hedberg@...il.com
CC:	davem@...emloft.net, linux-bluetooth@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Bluetooth: Revert "Bluetooth: rfcomm: Remove unnecessary
 krfcommd event"

Hi Sasha,

On 10/29/2014 09:32 PM, Sasha Levin wrote:
> This reverts commit e5842cdb0f4f2c68f6acd39e286e5d10d8c073e8.
> 
> We can't call rfcomm_process_sessions() while our task state is not
> TASK_RUNNING since rfcomm_process_sessions() tries to lock mutexes
> and sleep. The scheduler even complains about it:
> 
> [   21.683959] WARNING: CPU: 13 PID: 8165 at kernel/sched/core.c:7305 __might_sleep+0xe5/0x1b0()
> [   21.683962] do not call blocking ops when !TASK_RUNNING; state=1 set at rfcomm_run (net/bluetooth/rfcomm/core.c:2096)

This problem is in-process with Peter Z and Oleg and a new api
for handling nested sleeps.

The thread is here
http://www.gossamer-threads.com/lists/linux/kernel/2019181?do=post_view_threaded
and the reminder thread here
https://lkml.org/lkml/2014/10/27/343

Regards,
Peter Hurley
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