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

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Message-ID: <20150102124217.5c1aa5ef@wiggum>
Date:	Fri, 2 Jan 2015 12:42:17 +0100
From:	Michael Büsch <m@...s.ch>
To:	Rafał Miłecki <zajec5@...il.com>
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 Fri, 2 Jan 2015 12:19:12 +0100
Rafał Miłecki <zajec5@...il.com> wrote:

> 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.

D'oh.
Thanks for the notice.

-- 
Michael

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