linux-kernel - Re: [IWL4965] TX Power requested while scanning!

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Date:	Wed, 27 Apr 2011 12:18:08 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Stanislaw Gruszka <sgruszka@...hat.com>
Cc:	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [IWL4965] TX Power requested while scanning!

On Tue, 2011-04-26 at 08:32 +0200, Stanislaw Gruszka wrote:
> Warning correctly indicate a bug. Please try below patch.
> 
> diff --git a/drivers/net/wireless/iwlegacy/iwl4965-base.c b/drivers/net/wireless/iwlegacy/iwl4965-base.c
> index 58a2e63..46966e9 100644
> --- a/drivers/net/wireless/iwlegacy/iwl4965-base.c
> +++ b/drivers/net/wireless/iwlegacy/iwl4965-base.c
> @@ -2988,15 +2988,15 @@ static void iwl4965_bg_txpower_work(struct work_struct *work)
>  	struct iwl_priv *priv = container_of(work, struct iwl_priv,
>  			txpower_work);
>  
> +	mutex_lock(&priv->mutex);
> +
>  	/* If a scan happened to start before we got here
>  	 * then just return; the statistics notification will
>  	 * kick off another scheduled work to compensate for
>  	 * any temperature delta we missed here. */
>  	if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
>  	    test_bit(STATUS_SCANNING, &priv->status))
> -		return;
> -
> -	mutex_lock(&priv->mutex);
> +		goto out;
>  
>  	/* Regardless of if we are associated, we must reconfigure the
>  	 * TX power since frames can be sent on non-radar channels while
> @@ -3006,7 +3006,7 @@ static void iwl4965_bg_txpower_work(struct work_struct *work)
>  	/* Update last_temperature to keep is_calib_needed from running
>  	 * when it isn't needed... */
>  	priv->last_temperature = priv->temperature;
> -
> +out:
>  	mutex_unlock(&priv->mutex);
>  }
>  

0) This (compiles and) runs without apparent problems. I haven't seen
this WARNING with this patch applied. But please note that I actually
haven't seen that WARNING with (unpatched) rc4 since reporting it (last
Friday).

1) So feel free to add a "Reported-by:" tag and, perhaps, a "Tested-by:"
tag too.


Paul Bolle

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