linux-kernel - Re: [PATCH] rtl8xxxu: fix tx rate debug output

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Date:   Mon, 28 Nov 2016 16:12:12 -0500
From:   Jes Sorensen <Jes.Sorensen@...hat.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Kalle Valo <kvalo@...eaurora.org>, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rtl8xxxu: fix tx rate debug output

Arnd Bergmann <arnd@...db.de> writes:
> We accidentally print the rate before we know it for txdesc_v2:

Hi Arnd,

Thanks for the patch - Barry Day already posted a patch for this which
Kalle has applied to the wireless tree.

Cheers,
Jes


>
> wireless/realtek/rtl8xxxu/rtl8xxxu_core.c: In function 'rtl8xxxu_fill_txdesc_v2':
> wireless/realtek/rtl8xxxu/rtl8xxxu_core.c:4848:3: error: 'rate' may be used uninitialized in this function [-Werror=maybe-uninitialized]
>
> txdesc_v1 got it right, so let's do it the same way here.
>
> Fixes: b4c3d9cfb607 ("rtl8xxxu: Pass tx_info to fill_txdesc in order to have access to retry count")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
> index 04141e57b8ae..a9137abc3ad9 100644
> --- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
> +++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
> @@ -4844,16 +4844,16 @@ rtl8xxxu_fill_txdesc_v2(struct ieee80211_hw *hw, struct ieee80211_hdr *hdr,
>  
>  	tx_desc40 = (struct rtl8xxxu_txdesc40 *)tx_desc32;
>  
> -	if (rtl8xxxu_debug & RTL8XXXU_DEBUG_TX)
> -		dev_info(dev, "%s: TX rate: %d, pkt size %d\n",
> -			 __func__, rate, cpu_to_le16(tx_desc40->pkt_size));
> -
>  	if (rate_flags & IEEE80211_TX_RC_MCS &&
>  	    !ieee80211_is_mgmt(hdr->frame_control))
>  		rate = tx_info->control.rates[0].idx + DESC_RATE_MCS0;
>  	else
>  		rate = tx_rate->hw_value;
>  
> +	if (rtl8xxxu_debug & RTL8XXXU_DEBUG_TX)
> +		dev_info(dev, "%s: TX rate: %d, pkt size %d\n",
> +			 __func__, rate, cpu_to_le16(tx_desc40->pkt_size));
> +
>  	seq_number = IEEE80211_SEQ_TO_SN(le16_to_cpu(hdr->seq_ctrl));
>  
>  	tx_desc40->txdw4 = cpu_to_le32(rate);