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

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Date:   Thu, 25 Jul 2019 20:20:29 +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

On Thu, Jul 25, 2019 at 06:41:41PM +0200, Sergej Benilov wrote:
> On Thu, 25 Jul 2019 at 18:25, Andrew Lunn <andrew@...n.ch> wrote:
> >
> > > +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.
> 
> This has passed ./scripts/checkpatch.pl, as you had suggested for the
> previous patch.

checkpatch just checks for things like tabs vs space. 

I would expect the indentation to be more like:


     	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);
	} 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;

> > Why do you not put the data directly into data and avoid this memory
> > allocation, and memcpy?
> 
> Because EEPROM data from 'eeprom->offset' offset and of 'eeprom->len'
> length only is expected to be returned in 'data'.

O.K.

	Andrew