netdev - Re: [Patch net] wl1251: add a missing spin_lock

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Message-ID: <20170721075407.GA21902@amd>
Date:   Fri, 21 Jul 2017 09:54:07 +0200
From:   Pavel Machek <pavel@....cz>
To:     Cong Wang <xiyou.wangcong@...il.com>, davem@...emloft.net,
        Andrew Morton <akpm@...l.org>
Cc:     netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
        Kalle Valo <kvalo@...eaurora.org>
Subject: Re: [Patch net] wl1251: add a missing spin_lock_init()

Hi!

On Thu 2017-07-06 15:00:37, Cong Wang wrote:
> This fixes the following kernel warning:
> 
>   [ 5668.771453] BUG: spinlock bad magic on CPU#0, kworker/u2:3/9745
>   [ 5668.771850]  lock: 0xce63ef20, .magic: 00000000, .owner: <none>/-1,
>   .owner_cpu: 0
...
> by adding the missing spin_lock_init().
> 
> Reported-by: Pavel Machek <pavel@....cz>
> Cc: Kalle Valo <kvalo@...eaurora.org>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>


Ping? This is pretty trivial bugfix for an ugly problem. It would be
nice to take it in.

>  drivers/net/wireless/ti/wl1251/main.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/wireless/ti/wl1251/main.c b/drivers/net/wireless/ti/wl1251/main.c
> index bbf7604..1c539c8 100644
> --- a/drivers/net/wireless/ti/wl1251/main.c
> +++ b/drivers/net/wireless/ti/wl1251/main.c
> @@ -1571,6 +1571,7 @@ struct ieee80211_hw *wl1251_alloc_hw(void)
>  
>  	wl->state = WL1251_STATE_OFF;
>  	mutex_init(&wl->mutex);
> +	spin_lock_init(&wl->wl_lock);
>  
>  	wl->tx_mgmt_frm_rate = DEFAULT_HW_GEN_TX_RATE;
>  	wl->tx_mgmt_frm_mod = DEFAULT_HW_GEN_MODULATION_TYPE;

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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