linux-kernel - Re: [PATCH] drivers:net:wireless: Add proper locking for the function, b43_op_beacon_set

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Message-ID: <CACna6rxP5dB7ng5pf1jeJL7TTOq4xPC9B=wmrX+yeYK-hfF5uw@mail.gmail.com>
Date:	Fri, 2 Jan 2015 12:19:12 +0100
From:	Rafał Miłecki <zajec5@...il.com>
To:	Michael Büsch <m@...s.ch>
Cc:	Nicholas Krause <xerofoify@...il.com>,
	Stefano Brivio <stefano.brivio@...imi.it>,
	Network Development <netdev@...r.kernel.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	b43-dev <b43-dev@...ts.infradead.org>,
	Kalle Valo <kvalo@...eaurora.org>
Subject: Re: [PATCH] drivers:net:wireless: Add proper locking for the
 function, b43_op_beacon_set_tim in main.c

On 2 January 2015 at 10:27, Michael Büsch <m@...s.ch> wrote:
> On Fri,  2 Jan 2015 02:34:01 -0500
> Nicholas Krause <xerofoify@...il.com> wrote:
>
>> This adds proper locking for the function, b43_op_beacon_set_tim in main.c by using the mutex lock
>> in the structure pointer wl, as embedded into this pointer as a mutex in order to protect against
>> multiple access to the pointer wl when updating the templates for this pointer in the function,
>> b43_update_templates internally in the function, b43_op_beacon_set_tim.
>>
>> Signed-off-by: Nicholas Krause <xerofoify@...il.com>
>> ---
>>  drivers/net/wireless/b43/main.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c
>> index 47731cb..d568fc8 100644
>> --- a/drivers/net/wireless/b43/main.c
>> +++ b/drivers/net/wireless/b43/main.c
>> @@ -5094,8 +5094,9 @@ static int b43_op_beacon_set_tim(struct ieee80211_hw *hw,
>>  {
>>       struct b43_wl *wl = hw_to_b43_wl(hw);
>>
>> -     /* FIXME: add locking */
>> +     mutex_lock(&wl->mutex);
>>       b43_update_templates(wl);
>> +     mutex_unlock(&wl->mutex);
>>
>>       return 0;
>>  }
>
> Thanks for the patch.
>
> However, this does not work. We are in atomic context here.
> Please see the b43-dev mailing list archives for a recent thread about that.

Michael: guess who it was who sent the patch doing the same back in November.

Yes, the same troll.

-- 
Rafał
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