[PATCH] libertas: fix sleep confirmation

[Dan Williams]

On Wed, 2008-06-04 at 11:10 +0200, Holger Schurig wrote:
> This fixes an issus that made "iwconfig eth1 power on" non-working.
> When we get a "PS sleep" event, we have to confirm this to the firmware.
> The confirm happens with a command, but this command is special: the
> firmware won't send us a response. if_cs_host_to_card() is setting
> priv->dnld_sent anyway, so this variable stayed at DNLD_DATA_SENT and
> was never cleared back.
> 
> Now I put the special knowledge that the CMD_802_11_PS_MODE with
> CMD_SUBCMD_SLEEP_CONFIRMED doesn't need to need a response by directly
> clearing the dnld_sent state in lbs_send_confirmsleep().
> 
> Signed-off-by: Holger Schurig <hs4233 at mail.mn-solutions.de>

Acked-by: Dan Williams <dcbw at redhat.com>

> Index: wireless-testing/drivers/net/wireless/libertas/main.c
> ===================================================================
> --- wireless-testing.orig/drivers/net/wireless/libertas/main.c	2008-06-04 09:55:27.000000000 +0200
> +++ wireless-testing/drivers/net/wireless/libertas/main.c	2008-06-04 09:55:55.000000000 +0200
> @@ -765,8 +765,8 @@ static int lbs_thread(void *data)
>  		lbs_deb_thread("4: currenttxskb %p, dnld_sent %d\n",
>  		       priv->currenttxskb, priv->dnld_sent);
>  
> -		spin_lock_irq(&priv->driver_lock);
>  		/* Process any pending command response */
> +		spin_lock_irq(&priv->driver_lock);
>  		resp_idx = priv->resp_idx;
>  		if (priv->resp_len[resp_idx]) {
>  			spin_unlock_irq(&priv->driver_lock);
> Index: wireless-testing/drivers/net/wireless/libertas/cmd.c
> ===================================================================
> --- wireless-testing.orig/drivers/net/wireless/libertas/cmd.c	2008-06-04 09:55:27.000000000 +0200
> +++ wireless-testing/drivers/net/wireless/libertas/cmd.c	2008-06-04 09:56:20.000000000 +0200
> @@ -1858,6 +1858,9 @@ static void lbs_send_confirmsleep(struct
>  
>  	spin_lock_irqsave(&priv->driver_lock, flags);
>  
> +	/* We don't get a response on the sleep-confirmation */
> +	priv->dnld_sent = DNLD_RES_RECEIVED;
> +
>  	/* If nothing to do, go back to sleep (?) */
>  	if (!__kfifo_len(priv->event_fifo) && !priv->resp_len[priv->resp_idx])
>  		priv->psstate = PS_STATE_SLEEP;
> @@ -1920,12 +1923,12 @@ void lbs_ps_confirm_sleep(struct lbs_pri
>  
>  	lbs_deb_enter(LBS_DEB_HOST);
>  
> +	spin_lock_irqsave(&priv->driver_lock, flags);
>  	if (priv->dnld_sent) {
>  		allowed = 0;
>  		lbs_deb_host("dnld_sent was set\n");
>  	}
>  
> -	spin_lock_irqsave(&priv->driver_lock, flags);
>  	/* In-progress command? */
>  	if (priv->cur_cmd) {
>  		allowed = 0;