From mboxrd@z Thu Jan  1 00:00:00 1970
From: kvalo@qca.qualcomm.com (Kalle Valo)
Date: Thu, 4 May 2017 13:13:43 +0000
Subject: [PATCH 1/2] wcn36xx: Pass used skb to ieee80211_tx_status()
In-Reply-To: <20170428234247.GQ15143@minitux> (Bjorn Andersson's message of
 "Fri, 28 Apr 2017 16:42:47 -0700")
References: <20170426220444.10539-1-bjorn.andersson@linaro.org>
 <1493281332.2529.1.camel@sipsolutions.net>	<20170428234247.GQ15143@minitux>
Message-ID: <87fugkrchl.fsf@kamboji.qca.qualcomm.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

Bjorn Andersson <bjorn.andersson@linaro.org> writes:

> On Thu 27 Apr 01:22 PDT 2017, Johannes Berg wrote:
>
>> 
>> > @@ -371,7 +371,7 @@ static void reap_tx_dxes(struct wcn36xx *wcn,
>> > struct wcn36xx_dxe_ch *ch)
>> > ?			info = IEEE80211_SKB_CB(ctl->skb);
>> > ?			if (!(info->flags &
>> > IEEE80211_TX_CTL_REQ_TX_STATUS)) {
>> > ?				/* Keep frame until TX status comes
>> > */
>> > -				ieee80211_free_txskb(wcn->hw, ctl-
>> > >skb);
>> > +				ieee80211_tx_status(wcn->hw, ctl-
>> > >skb);
>> > 
>> 
>> I don't think this is a good idea.
>
> Thanks for letting me know :)
>
>> This code intentionally checked if TX status was requested, and if not
>> then it doesn't go to the effort of building it.
>> 
>
> What I'm finding puzzling is the fact that the only caller of
> ieee80211_led_tx() is ieee80211_tx_status() and it seems like drivers,
> such as ath10k, call this for each packet handled - but I'm likely
> missing something.
>
>> As it is with your patch, it'll go and report the TX status without any
>> TX status information - which is handled in wcn36xx_dxe_tx_ack_ind()
>> for those frames needing it.
>> 
>
> Right, it doesn't sound desired. However, during normal operation I'm
> not seeing IEEE80211_TX_CTL_REQ_TX_STATUS being set and as such
> ieee80211_led_tx() is never called.

So what's the conclusion? How do we get leds working?

-- 
Kalle Valo