netdev - Re: [PATCH net-next 1/3] enetc: Add mdio bus driver for the PCIe MDIO endpoint

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Date:   Wed, 24 Jul 2019 00:24:54 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Claudiu Manoil <claudiu.manoil@....com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        devicetree@...r.kernel.org, netdev@...r.kernel.org,
        alexandru.marginean@....com, linux-kernel@...r.kernel.org,
        Li Yang <leoyang.li@....com>, Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net-next 1/3] enetc: Add mdio bus driver for the PCIe
 MDIO endpoint

> +	bus = mdiobus_alloc_size(sizeof(u32 *));
> +	if (!bus)
> +		return -ENOMEM;
> +

> +	bus->priv = pci_iomap_range(pdev, 0, ENETC_MDIO_REG_OFFSET, 0);

This got me confused for a while. You allocate space for a u32
pointer. bus->priv will point to this space. However, you are not
using this space, you {ab}use the pointer to directly hold the return
from pci_iomap_range(). This works, but sparse is probably unhappy,
and you are wasting the space the u32 pointer takes.

    Andrew