linux-kernel - Re: [PATCH] mt7601u: phy: simplify zero check on val

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Message-ID: <2f9ab78a-ea76-0b60-375a-9a22cd2ff0f5@arm.com>
Date:   Fri, 20 Sep 2019 14:25:21 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Colin King <colin.king@...onical.com>,
        Jakub Kicinski <kubakici@...pl>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S . Miller" <davem@...emloft.net>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mt7601u: phy: simplify zero check on val

On 20/09/2019 13:54, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently the zero check on val to break out of a loop
> is a little obscure.  Replace the val is zero and break check
> with a loop while value is non-zero.
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>   drivers/net/wireless/mediatek/mt7601u/phy.c | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/net/wireless/mediatek/mt7601u/phy.c b/drivers/net/wireless/mediatek/mt7601u/phy.c
> index 06f5702ab4bd..4e0e473caae1 100644
> --- a/drivers/net/wireless/mediatek/mt7601u/phy.c
> +++ b/drivers/net/wireless/mediatek/mt7601u/phy.c
> @@ -213,9 +213,7 @@ int mt7601u_wait_bbp_ready(struct mt7601u_dev *dev)
>   
>   	do {
>   		val = mt7601u_bbp_rr(dev, MT_BBP_REG_VERSION);
> -		if (val && ~val)
> -			break;

AFAICS, this effectively implements "while (val == 0 || val == 0xff)", 
which is not at all equivalent to "while(val)"... :/

Robin.

> -	} while (--i);
> +	} while (val && --i);
>   
>   	if (!i) {
>   		dev_err(dev->dev, "Error: BBP is not ready\n");
>