linux-kernel - Re: [PATCH v2] net: asix: fix uninit value in asix_mdio

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Message-ID: <YRb419yLsAtDVShf@lunn.ch>
Date:   Sat, 14 Aug 2021 00:57:27 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Pavel Skripkin <paskripkin@...il.com>
Cc:     davem@...emloft.net, kuba@...nel.org, linux@...pel-privat.de,
        himadrispandya@...il.com, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzbot+a631ec9e717fb0423053@...kaller.appspotmail.com
Subject: Re: [PATCH v2] net: asix: fix uninit value in asix_mdio_read

> diff --git a/drivers/net/usb/asix_common.c b/drivers/net/usb/asix_common.c
> index ac92bc52a85e..7019c25e591c 100644
> --- a/drivers/net/usb/asix_common.c
> +++ b/drivers/net/usb/asix_common.c
> @@ -468,18 +468,25 @@ int asix_mdio_read(struct net_device *netdev, int phy_id, int loc)
>  	struct usbnet *dev = netdev_priv(netdev);
>  	__le16 res;
>  	u8 smsr;
> -	int i = 0;
> +	int i;
>  	int ret;
>  
>  	mutex_lock(&dev->phy_mutex);
> -	do {
> +	for (i = 0; i < 30; ++i) {
>  		ret = asix_set_sw_mii(dev, 0);
>  		if (ret == -ENODEV || ret == -ETIMEDOUT)
>  			break;
>  		usleep_range(1000, 1100);
>  		ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG,
>  				    0, 0, 1, &smsr, 0);
> -	} while (!(smsr & AX_HOST_EN) && (i++ < 30) && (ret != -ENODEV));
> +		if (ret == -ENODEV)
> +			break;
> +		else if (ret < 0)
> +			continue;
> +		else if (smsr & AX_HOST_EN)
> +			break;
> +	}
> +

Yes, this looks good. And Jakub is correct, there are 3 other bits of
similar code you should look at.

     Andrew