linux-kernel - Re: [PATCH 1/3] bluetooth: add write_lock_bh to __l2cap_chan

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Date:	Sat, 28 Feb 2009 02:54:16 -0300
From:	"Gustavo F. Padovan" <gustavo@....ic.unicamp.br>
To:	linux-bluetooth@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] bluetooth: add write_lock_bh to __l2cap_chan_link

On Sat, Feb 28, 2009 at 2:02 AM, Gustavo F. Padovan
<gustavo@....ic.unicamp.br> wrote:
> fix race condition
>
> Signed-off-by: Gustavo F. Padovan <gustavo@....ic.unicamp.br>
> ---
>  net/bluetooth/l2cap.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
>
> diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
> index ca4d3b4..355f375 100644
> --- a/net/bluetooth/l2cap.c
> +++ b/net/bluetooth/l2cap.c
> @@ -175,12 +175,14 @@ static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk)
>  {
>        sock_hold(sk);
>
> +       write_lock_bh(&l->lock);
>        if (l->head)
>                l2cap_pi(l->head)->prev_c = sk;
>
>        l2cap_pi(sk)->next_c = l->head;
>        l2cap_pi(sk)->prev_c = NULL;
>        l->head = sk;
> +       write_unlock_bh(&l->lock);
>  }
>
>  static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk)



This patch is wrong, ignore it.


> --
> 1.6.0.6
>
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-- 
Gustavo F. Padovan

Computer Engineering Student
Institute of Computing - IC
University of Campinas - UNICAMP

email: gustavo@....ic.unicamp.br
gtalk: gfpadovan@...il.com
mobile: +55 19 81030803
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