Return-path: <linux-wireless-owner@vger.kernel.org>
Received: from mail.byterg.ru ([217.12.248.131]:50238 "EHLO mail.byterg.ru"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1752322AbbCCIWI (ORCPT <rfc822;linux-wireless@vger.kernel.org>);
	Tue, 3 Mar 2015 03:22:08 -0500
Received: from [192.168.10.51]
	 by mail.byterg.ru with esmtp  (envelope-from <brilliantov@byterg.ru>)
	 id 1YShBe-0003BN-OJ
	for linux-wireless@vger.kernel.org; Tue, 03 Mar 2015 11:24:14 +0400
Message-ID: <54F56F50.6070505@byterg.ru> (sfid-20150303_092212_305523_BB3D19DD)
Date: Tue, 03 Mar 2015 11:22:40 +0300
From: Brilliantov Kirill Vladimirovich <brilliantov@byterg.ru>
Reply-To: brilliantov@byterg.ru
MIME-Version: 1.0
To: linux-wireless@vger.kernel.org
Subject: 8188e: possible recursive locking detected on linux-3.18.7
Content-Type: text/plain; charset=utf-8; format=flowed
Sender: linux-wireless-owner@vger.kernel.org
List-ID: <linux-wireless.vger.kernel.org>

Hello!
I work with linux-3.18.7 on board with FreeScale iMX287 ARM CPU, for 
tests I use USB TP-Link TL-WN725N on RTL8188e chip.

[    7.802249] usb 1-1: new high-speed USB device number 2 using ci_hdrc
[    7.982221] Chip Version Info: 
CHIP_8188E_Normal_Chip_TSMC_D_CUT_1T1R_RomVer(0)

ifconfig wlan0 up
[   50.193673] MAC Address = e8:de:27:a3:ee:9d

iwlist wlan0 scan
[   56.633485]
[   56.635036] =============================================
[   56.640453] [ INFO: possible recursive locking detected ]
[   56.645876] 3.18.7+ #40 Not tainted
[   56.649379] ---------------------------------------------
[   56.654794] RTW_CMD_THREAD/84 is trying to acquire lock:
[   56.660118]  (&(&(pqueue->lock))->rlock){+.-...}, at: [<c0232fdc>] 
_rtw_alloc_network+0x14/0xc4
[   56.668948]
[   56.668948] but task is already holding lock:
[   56.674801]  (&(&(pqueue->lock))->rlock){+.-...}, at: [<c0235de8>] 
rtw_update_scanned_network+0x18/0x250
[   56.684378]
[   56.684378] other info that might help us debug this:
[   56.690924]  Possible unsafe locking scenario:
[   56.690924]
[   56.696858]        CPU0
[   56.699313]        ----
[   56.701766]   lock(&(&(pqueue->lock))->rlock);
[   56.706244]   lock(&(&(pqueue->lock))->rlock);
[   56.710721]
[   56.710721]  *** DEADLOCK ***
[   56.710721]
[   56.716662]  May be due to missing lock nesting notation
[   56.716662]
[   56.723474] 2 locks held by RTW_CMD_THREAD/84:
[   56.727927]  #0:  (&(&(pmlmepriv->lock))->rlock){+.....}, at: 
[<c023609c>] rtw_survey_event_callback+0x7c/0x1c4
[   56.738115]  #1:  (&(&(pqueue->lock))->rlock){+.-...}, at: 
[<c0235de8>] rtw_update_scanned_network+0x18/0x250
[   56.748125]
[   56.748125] stack backtrace:
[   56.752516] CPU: 0 PID: 84 Comm: RTW_CMD_THREAD Not tainted 3.18.7+ #40
[   56.759198] [<c000e010>] (unwind_backtrace) from [<c000c47c>] 
(show_stack+0x10/0x14)
[   56.767002] [<c000c47c>] (show_stack) from [<c003cfa0>] 
(validate_chain+0xd14/0x1154)
[   56.774878] [<c003cfa0>] (validate_chain) from [<c003d940>] 
(__lock_acquire+0x560/0xbb0)
[   56.783011] [<c003d940>] (__lock_acquire) from [<c003dff4>] 
(lock_acquire+0x64/0x78)
[   56.790804] [<c003dff4>] (lock_acquire) from [<c035cbf4>] 
(_raw_spin_lock_bh+0x44/0x58)
[   56.798865] [<c035cbf4>] (_raw_spin_lock_bh) from [<c0232fdc>] 
(_rtw_alloc_network+0x14/0xc4)
[   56.807442] [<c0232fdc>] (_rtw_alloc_network) from [<c0235e68>] 
(rtw_update_scanned_network+0x98/0x250)
[   56.816881] [<c0235e68>] (rtw_update_scanned_network) from 
[<c0236118>] (rtw_survey_event_callback+0xf8/0x1c4)
[   56.826922] [<c0236118>] (rtw_survey_event_callback) from 
[<c023683c>] (mlme_evt_hdl+0x5c/0xec)
[   56.835658] [<c023683c>] (mlme_evt_hdl) from [<c022aef0>] 
(rtw_cmd_thread+0x110/0x348)
[   56.843623] [<c022aef0>] (rtw_cmd_thread) from [<c002c964>] 
(kthread+0xb8/0xd4)
[   56.850972] [<c002c964>] (kthread) from [<c0009680>] 
(ret_from_fork+0x14/0x34)

I get network list success.

This problem fixed in next linux versions?
Thank you and excuse me for my bad english.

-- 
Best regards,
Brilliantov Kirill Vladimirovich