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Date: Wed, 18 Jul 2012 20:50:53 +0530
Message-ID: <CAD2nsn0s9V4L6W_AzTqrjgZQT1a3SJdLeCXAV9YDbGE+qX4QHw@mail.gmail.com> (sfid-20120718_172057_456614_9428667B)
Subject: Re: [PATCH] cfg80211: Fix mutex locking in reg_last_request_cell_base
From: Mohammed Shafi <shafi.wireless@gmail.com>
To: Luciano Coelho <coelho@ti.com>
Cc: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>,
	Johannes Berg <johannes@sipsolutions.net>,
	linux-wireless@vger.kernel.org, Luis Rodriguez <mcgrof@gmail.com>
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Sender: linux-wireless-owner@vger.kernel.org
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Hi Luca,

On Wed, Jul 18, 2012 at 8:16 PM, Luciano Coelho <coelho@ti.com> wrote:
> On Wed, 2012-07-18 at 18:11 +0530, Mohammed Shafi Shajakhan wrote:
>> From: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
>>
>> should fix the following issue
>>
>>       [ 3229.815012] [ BUG: lock held when returning to user space! ]
>>       [ 3229.815016] 3.5.0-rc7-wl #28 Tainted: G        W  O
>>       [ 3229.815017]
>>       ------------------------------------------------
>>       [ 3229.815019] wpa_supplicant/5783 is leaving the kernel with locks still held!
>>       [ 3229.815022] 1 lock held by wpa_supplicant/5783:
>>       [ 3229.815023]  #0: (reg_mutex){+.+.+.}, at: [<fa65834d>]
>>       reg_last_request_cell_base+0x1d/0x60 [cfg80211]
>>
>> Cc: Luis Rodriguez <mcgrof@gmail.com>
>> Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
>> ---
>
> Tested-by: Luciano Coelho <coelho@ti.com>
>
> This actually also fixes a similar circular lock dependency bug when
> starting AP mode with hostapd (which is the case I tested this patch
> on): http://pastebin.com/AVczE1Ej

thanks !

>
> --
> Luca.
>
> --
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-- 
thanks,
shafi