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Subject: NAK: [PATCH][next] net: usb: asix: ax88772: Fix less than zero
 comparison of a u16
From:   Colin Ian King <colin.king@canonical.com>
To:     "David S . Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Oleksij Rempel <linux@rempel-privat.de>,
        linux-usb@vger.kernel.org, netdev@vger.kernel.org
Cc:     kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20210608145823.159467-1-colin.king@canonical.com>
Message-ID: <26127b07-6f9e-12bb-6d2e-edf6819c08f1@canonical.com>
Date:   Tue, 8 Jun 2021 16:05:33 +0100
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On 08/06/2021 15:58, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.com>
> 
> The comparison of the u16 priv->phy_addr < 0 is always false because
> phy_addr is unsigned. Fix this by assigning the return from the call
> to function asix_read_phy_addr to int ret and using this for the
> less than zero error check comparison.
> 
> Addresses-Coverity: ("Unsigned compared against 0")
> Fixes: e532a096be0e ("net: usb: asix: ax88772: add phylib support")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
>  drivers/net/usb/asix_devices.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/usb/asix_devices.c b/drivers/net/usb/asix_devices.c
> index 57dafb3262d9..211c5a87eb15 100644
> --- a/drivers/net/usb/asix_devices.c
> +++ b/drivers/net/usb/asix_devices.c
> @@ -704,9 +704,10 @@ static int ax88772_init_phy(struct usbnet *dev)
>  	struct asix_common_private *priv = dev->driver_priv;
>  	int ret;
>  
> -	priv->phy_addr = asix_read_phy_addr(dev, true);
> -	if (priv->phy_addr < 0)
> +	ret = asix_read_phy_addr(dev, true);
> +	if (ret < 0)
>  		return priv->phy_addr;
> +	priv->phy_addr = ret;
>  
>  	snprintf(priv->phy_name, sizeof(priv->phy_name), PHY_ID_FMT,
>  		 priv->mdio->id, priv->phy_addr);
> 

Wrong commit message. I'll send a new fix.

Colin