Re: [PATCH ] wl12xx: BA receiver support

[Shahar Levi <shahar_levi@ti.com>]

On 11/25/2010 11:52 AM, Juuso Oikarinen wrote:
> On Wed, 2010-11-24 at 18:33 +0200, ext Shahar Levi wrote:
>> Add new ampdu_action ops to support receiver BA.
>> The BA initiator session management in FW independently.
>>
>> Signed-off-by: Shahar Levi<shahar_levi@ti.com>
>> ---
>>
>> +int wl1271_op_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
>> +			   enum ieee80211_ampdu_mlme_action action,
>> +			   struct ieee80211_sta *sta, u16 tid, u16 *ssn)
>> +{
>> +	struct wl1271 *wl = hw->priv;
>> +	int ret;
>> +
>> +	ret = wl1271_ps_elp_wakeup(wl, false);
>> +	if (ret<  0)
>> +		goto out;
>> +
>> +	switch (action) {
>> +	case IEEE80211_AMPDU_RX_START:
>> +		if (wl->ba_allowed) {
>> +			ret = wl1271_acx_set_ba_receiver_session(wl, tid, ssn,
>> +								 true);
>> +			if (!ret)
>> +				wl->ba_rx_bitmap |= (u8)(BIT(0)<<  tid);
>> +		} else
>> +			ret = -EPERM;
>> +		break;
>> +
>> +	case IEEE80211_AMPDU_RX_STOP:
>> +		ret = wl1271_acx_set_ba_receiver_session(wl, tid, ssn, false);
>> +		if (!ret)
>> +			wl->ba_rx_bitmap&= ~(u8)(BIT(0)<<  tid);
>> +		break;
>> +
>> +	/*
>> +	 * The BA initiator session management in FW independently.
>> +	 * Falling break here on purpose for all TX APDU commands.
>> +	 */
>> +	case IEEE80211_AMPDU_TX_START:
>> +	case IEEE80211_AMPDU_TX_STOP:
>> +	case IEEE80211_AMPDU_TX_OPERATIONAL:
>> +		ret = -EINVAL;
>> +		break;
>> +
>> +	default:
>> +		wl1271_error("Incorrect ampdu action id=%x\n", action);
>> +		ret = -ENODEV;
>> +	}
>> +
>> +	wl1271_ps_elp_sleep(wl);
>> +
>> +out:
>> +	return ret;
>> +}
>> +
>
> Seems to me that locking of the wl1271 mutex is missing here.
You right. will be fix on v2

>
> Also, I think it would be good to add checking for interface status
> (wl->state == WL1271_STATE_OFF) here too. In normal cases this would not
> be needed, but there are at least some hardware recovery scenarios where
> this could be called while the firmware is off, causing all types of odd
> behavior.
it seems that it is good protraction. the setting of WL1271_STATE_OFF is 
in wl1271_alloc_hw() and __wl1271_op_remove_interface(). i was expect 
that in static void wl1271_recovery_work() after validate (wl->state != 
WL1271_STATE_ON) we will set it to WL1271_STATE_OFF.

> -Juuso
>