linux-kernel - Re: [PATCH] ata: pata_ali: remove redundant return statement

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Date:   Thu, 13 Jan 2022 08:52:09 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Colin Ian King <colin.i.king@...il.com>, linux-ide@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ata: pata_ali: remove redundant return statement

On 1/13/22 08:47, Colin Ian King wrote:
> A return statement is unnecessarily complicated, currently value
> in variable mask is bitwise-masked and the variable is being
> updated and then returned. Just updating the mask is all that is
> required as the following statement is a return.
> 
> Signed-off-by: Colin Ian King <colin.i.king@...il.com>
> ---
>  drivers/ata/pata_ali.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/ata/pata_ali.c b/drivers/ata/pata_ali.c
> index ab28a6707b94..1b90cda27246 100644
> --- a/drivers/ata/pata_ali.c
> +++ b/drivers/ata/pata_ali.c
> @@ -123,7 +123,7 @@ static unsigned long ali_20_filter(struct ata_device *adev, unsigned long mask)
>  		mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
>  	ata_id_c_string(adev->id, model_num, ATA_ID_PROD, sizeof(model_num));
>  	if (strstr(model_num, "WDC"))
> -		return mask &= ~ATA_MASK_UDMA;

Yeah, not to mention that is really ugly as the return should really
have been:

return mask & ~ATA_MASK_UDMA;

> +		mask &= ~ATA_MASK_UDMA;
>  	return mask;
>  }
>  

Will queue this up.

-- 
Damien Le Moal
Western Digital Research