linux-kernel - Re: [PATCH v2] rtlwifi: rtl8192cu: Remove variable self-assignment in rf.c

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Date:   Thu, 8 Feb 2018 19:15:46 -0600
From:   Larry Finger <Larry.Finger@...inger.net>
To:     Matthias Kaehlcke <mka@...omium.org>,
        Ping-Ke Shih <pkshih@...ltek.com>,
        Kalle Valo <kvalo@...eaurora.org>
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Guenter Roeck <groeck@...omium.org>,
        Justin TerAvest <teravest@...omium.org>,
        Craig Bergstrom <craigb@...omium.org>
Subject: Re: [PATCH v2] rtlwifi: rtl8192cu: Remove variable self-assignment in
 rf.c

On 02/08/2018 06:57 PM, Matthias Kaehlcke wrote:
> In _rtl92c_get_txpower_writeval_by_regulatory() the variable writeVal
> is assigned to itself in an if ... else statement, apparently only to
> document that the branch condition is handled and that a previously read
> value should be returned unmodified. The self-assignment causes clang to
> raise the following warning:
> 
> drivers/net/wireless/realtek/rtlwifi/rtl8192cu/rf.c:304:13:
>    error: explicitly assigning value of variable of type 'u32'
>      (aka 'unsigned int') to itself [-Werror,-Wself-assign]
>    writeVal = writeVal;
> 
> Delete the branch with the self-assignment.
> 
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
> Changes in v2:
> - Delete the 'else if' branch entirely
> 
>   drivers/net/wireless/realtek/rtlwifi/rtl8192cu/rf.c | 3 ---
>   1 file changed, 3 deletions(-)

Acked-by: Larry Finger <Larry.Finger@...inger.net>


> 
> diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/rf.c b/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/rf.c
> index 9cff6bc4049c..cf551785eb08 100644
> --- a/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/rf.c
> +++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192cu/rf.c
> @@ -299,9 +299,6 @@ static void _rtl92c_get_txpower_writeval_by_regulatory(struct ieee80211_hw *hw,
>   			writeVal = 0x00000000;
>   		if (rtlpriv->dm.dynamic_txhighpower_lvl == TXHIGHPWRLEVEL_BT1)
>   			writeVal = writeVal - 0x06060606;
> -		else if (rtlpriv->dm.dynamic_txhighpower_lvl ==
> -			 TXHIGHPWRLEVEL_BT2)
> -			writeVal = writeVal;
>   		*(p_outwriteval + rf) = writeVal;
>   	}
>   }
>