Re: [PATCH net v1 1/1] net: usb: asix: ax88772: Increase phy_name size

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

On Tue, Mar 18, 2025 at 06:09:12PM +0100, Andrew Lunn wrote:
> On Tue, Mar 18, 2025 at 06:54:48PM +0200, Andy Shevchenko wrote:
> > On Tue, Mar 18, 2025 at 05:49:05PM +0100, Andrew Lunn wrote:

...

> > > > -	char phy_name[20];
> > > > +	char phy_name[MII_BUS_ID_SIZE + 5];
> > > 
> > > Could you explain the + 5?
> > > 
> > > https://elixir.bootlin.com/linux/v6.13.7/source/drivers/net/ethernet/davicom/dm9051.c#L1156
> > > https://elixir.bootlin.com/linux/v6.13.7/source/drivers/net/ethernet/freescale/fec_main.c#L2454
> > > https://elixir.bootlin.com/linux/v6.13.7/source/drivers/net/ethernet/xilinx/ll_temac.h#L348
> > > 
> > > The consensus seems to be + 3.

And shouldn't it be 4 actually? %s [MII_BUS_ID_SIZE] + ':' + '%02x' + nul

> > u16, gcc can't proove the range, it assumes 65536 is the maximum.
> > 
> > include/linux/phy.h:312:20: note: directive argument in the range [0, 65535]
> 
> How about after
> 
>         ret = asix_read_phy_addr(dev, priv->use_embdphy);
> 	if (ret < 0)
> 		goto free;
> 
> add
> 
>         if (ret > 31) {
> 	        netdev_err(dev->net, "Invalid PHY ID %d\n", ret);
> 	        return -ENODEV;
> 	}
> 
> and see if GCC can follow that?

No, with + 3 it doesn't work, need + 4.

Another possibility to change the _FMT to have %02hhx instead of %02x.

Tell me which one should I take?

-- 
With Best Regards,
Andy Shevchenko