netdev - Re: [PATCH][next] net: pcs: xpcs: Fix a less than zero u16 comparision error

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Message-ID: <20210615134206.ayjpjk2sqv7umjah@skbuf>
Date:   Tue, 15 Jun 2021 16:42:06 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] net: pcs: xpcs: Fix a less than zero u16
 comparision error

Some nitpicks, fix them if you'd like, ignore them if not:

s/comparision/comparison/

On Tue, Jun 15, 2021 at 02:16:01PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently the check for the u16 variable val being less than zero is
> always false because val is unsigned. Fix this by using the int
> variable for the assignment and less than zero check.
> 
> Addresses-Coverity: ("Unsigned compared against 0")
> Fixes: f7380bba42fd ("net: pcs: xpcs: add support for NXP SJA1110")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/net/pcs/pcs-xpcs-nxp.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/pcs/pcs-xpcs-nxp.c b/drivers/net/pcs/pcs-xpcs-nxp.c
> index de99c37cf2ae..80430ca94fbf 100644
> --- a/drivers/net/pcs/pcs-xpcs-nxp.c
> +++ b/drivers/net/pcs/pcs-xpcs-nxp.c
> @@ -152,11 +152,11 @@ static int nxp_sja1110_pma_config(struct dw_xpcs *xpcs,
>  	/* Enable TX and RX PLLs and circuits.
>  	 * Release reset of PMA to enable data flow to/from PCS.
>  	 */
> -	val = xpcs_read(xpcs, MDIO_MMD_VEND2, SJA1110_POWERDOWN_ENABLE);
> -	if (val < 0)
> -		return val;
> +	ret = xpcs_read(xpcs, MDIO_MMD_VEND2, SJA1110_POWERDOWN_ENABLE);
> +	if (ret < 0)
> +		return ret;
>  
> -	val &= ~(SJA1110_TXPLL_PD | SJA1110_TXPD | SJA1110_RXCH_PD |
> +	val = ret & ~(SJA1110_TXPLL_PD | SJA1110_TXPD | SJA1110_RXCH_PD |

You could have realigned the following 2 lines as well with the new
position of SJA1110_TXPLL_PD.

>  		 SJA1110_RXBIAS_PD | SJA1110_RESET_SER_EN |
>  		 SJA1110_RESET_SER | SJA1110_RESET_DES);
>  	val |= SJA1110_RXPKDETEN | SJA1110_RCVEN;
> -- 
> 2.31.1
> 

Reviewed-by: Vladimir Oltean <vladimir.oltean@....com>