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

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Message-ID: <CABXOdTcMKkiPDTgg_8tzMDMb0=jRbuQq_Y_qEWiobWhDp0mD-g@mail.gmail.com>
Date:   Thu, 8 Feb 2018 17:24:01 -0800
From:   Guenter Roeck <groeck@...gle.com>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Ping-Ke Shih <pkshih@...ltek.com>,
        Larry Finger <Larry.Finger@...inger.net>,
        Kalle Valo <kvalo@...eaurora.org>,
        linux-wireless@...r.kernel.org, netdev <netdev@...r.kernel.org>,
        linux-kernel <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 Thu, Feb 8, 2018 at 4:57 PM, Matthias Kaehlcke <mka@...omium.org> 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>

Reviewed-by: Guenter Roeck <groeck@...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(-)
>
> 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;
>         }
>  }
> --
> 2.16.0.rc1.238.g530d649a79-goog
>