netdev - Re: [PATCH] sis900: add support for ethtool --eeprom-dump

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Date:   Thu, 25 Jul 2019 18:25:43 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Sergej Benilov <sergej.benilov@...glemail.com>
Cc:     venza@...wnhat.org, netdev@...r.kernel.org
Subject: Re: [PATCH] sis900: add support for ethtool --eeprom-dump

> +static int sis900_read_eeprom(struct net_device *net_dev, u8 *buf)
> +{
> +	struct sis900_private *sis_priv = netdev_priv(net_dev);
> +	void __iomem *ioaddr = sis_priv->ioaddr;
> +	int wait, ret = -EAGAIN;
> +	u16 signature;
> +	u16 *ebuf = (u16 *)buf;
> +	int i;
> +
> +	if (sis_priv->chipset_rev == SIS96x_900_REV) {
> +		sw32(mear, EEREQ);
> +		for (wait = 0; wait < 2000; wait++) {
> +			if (sr32(mear) & EEGNT) {
> +				/* read 16 bits, and index by 16 bits */
> +				for (i = 0; i < sis_priv->eeprom_size / 2; i++)
> +					ebuf[i] = (u16)read_eeprom(ioaddr, i);
> +			ret = 0;
> +			break;
> +			}
> +		udelay(1);
> +		}
> +	sw32(mear, EEDONE);

The indentation looks all messed up here.

> +	} else {
> +		signature = (u16)read_eeprom(ioaddr, EEPROMSignature);
> +		if (signature != 0xffff && signature != 0x0000) {
> +			/* read 16 bits, and index by 16 bits */
> +			for (i = 0; i < sis_priv->eeprom_size / 2; i++)
> +				ebuf[i] = (u16)read_eeprom(ioaddr, i);
> +			ret = 0;
> +		}
> +	}
> +	return ret;
> +}
> +
> +#define SIS900_EEPROM_MAGIC	0xBABE
> +static int sis900_get_eeprom(struct net_device *dev, struct ethtool_eeprom *eeprom, u8 *data)
> +{
> +	struct sis900_private *sis_priv = netdev_priv(dev);
> +	u8 *eebuf;
> +	int res;
> +
> +	eebuf = kmalloc(sis_priv->eeprom_size, GFP_KERNEL);
> +	if (!eebuf)
> +		return -ENOMEM;
> +
> +	eeprom->magic = SIS900_EEPROM_MAGIC;
> +	spin_lock_irq(&sis_priv->lock);
> +	res = sis900_read_eeprom(dev, eebuf);
> +	spin_unlock_irq(&sis_priv->lock);
> +	if (!res)
> +		memcpy(data, eebuf + eeprom->offset, eeprom->len);
> +	kfree(eebuf);

Why do you not put the data directly into data and avoid this memory
allocation, and memcpy?

	    Andrew