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Re: [PATCH] ath10k: fix bug in masking of TID value

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Erik Stromdahl <erik.stromdahl@xxxxxxxxx> writes:

> Although the TID mask is 0xf, the modulus operation does still not
> produce identical results as the bitwise and operator.
>
> If the TID is 15, the modulus operation will "convert" it to 0, whereas
> the bitwise and will keep it as 15.
>
> Signed-off-by: Erik Stromdahl <erik.stromdahl@xxxxxxxxx>
> ---
>  drivers/net/wireless/ath/ath10k/htt_tx.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/ath/ath10k/htt_tx.c b/drivers/net/wireless/ath/ath10k/htt_tx.c
> index 89157c5b5e5f..be5b52aaffa6 100644
> --- a/drivers/net/wireless/ath/ath10k/htt_tx.c
> +++ b/drivers/net/wireless/ath/ath10k/htt_tx.c
> @@ -1056,7 +1056,7 @@ static u8 ath10k_htt_tx_get_tid(struct sk_buff *skb, bool is_eth)
>  	if (!is_eth && ieee80211_is_mgmt(hdr->frame_control))
>  		return HTT_DATA_TX_EXT_TID_MGMT;
>  	else if (cb->flags & ATH10K_SKB_F_QOS)
> -		return skb->priority % IEEE80211_QOS_CTL_TID_MASK;
> +		return skb->priority & IEEE80211_QOS_CTL_TID_MASK;

I guess you just found this during code review? If yes, I'll add that to
the commit log.

-- 
Kalle Valo



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