linux-kernel - Re: [PATCH] ath9k: remove setting of 'is

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Message-ID: <871qwkr3ue.fsf@toke.dk>
Date:   Mon, 23 May 2022 11:32:57 +0200
From:   Toke Høiland-Jørgensen <toke@...e.dk>
To:     Tom Rix <trix@...hat.com>, kvalo@...nel.org, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Tom Rix <trix@...hat.com>
Subject: Re: [PATCH] ath9k: remove setting of 'is_ext' parameter

Tom Rix <trix@...hat.com> writes:

> cppcheck reports
> [drivers/net/wireless/ath/ath9k/dfs.c:93]: (style) Assignment of function parameter has no effect outside the function.
>
> Both the is_ctl and the is_ext parameters are set in the if-else statement.
> But only is_ctl is used later, so setting is_ext is not needed and can be removed.
>
> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
>  drivers/net/wireless/ath/ath9k/dfs.c | 2 --
>  1 file changed, 2 deletions(-)
>
> diff --git a/drivers/net/wireless/ath/ath9k/dfs.c b/drivers/net/wireless/ath/ath9k/dfs.c
> index acb9602aa464..47cdfb584eb0 100644
> --- a/drivers/net/wireless/ath/ath9k/dfs.c
> +++ b/drivers/net/wireless/ath/ath9k/dfs.c
> @@ -89,8 +89,6 @@ static int ath9k_get_max_index_ht40(struct ath9k_dfs_fft_40 *fft,
>  			int mag_upper = fft_max_magnitude(fft->upper_bins);
>  			if (mag_upper > mag_lower)
>  				is_ctl = false;
> -			else
> -				is_ext = false;

Hmm, not so sure about this; while the assignment is technically
useless, I think it makes the intent of the code clearer (i.e.,
disambiguating between is_ctl or is_ext; upon exiting that block is_ctl
or is_ext will always be false(...

-Toke