linux-kernel - Re: [PATCH 5/5] drivers: mfd: Fix resource request for [mem 0x00000000]

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Date:	Thu, 08 Nov 2012 11:04:54 -0600 (CST)
From:	Aaron Sierra <asierra@...-inc.com>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Peter Tyser <ptyser@...-inc.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] drivers: mfd: Fix resource request for [mem 0x00000000]

> The older southbridges supported by the lpc_ich driver do not
> provide memory-mapped space of the root complex. The driver
> correctly avoids computing the iomem address in this case, yet
> submits a zeroed resource request anyway (via mfd_add_devices()).
> 
> Remove the iomem resource from the resource array submitted to the
> mfd core for the older southbridges.
> 

Peter, thanks for catching this.

> +	} else {
> +		/* So don't register iomem for TCO ver 1 */
> +		--lpc_ich_cells[LPC_WDT].num_resources;

My only complaint is that pre-decrementing num_resources isn't
necessary and doesn't match the other cases where num_resources is
decremented (post-decremented), like here:

        if (!base_addr) {
                dev_err(&dev->dev, "I/O space for ACPI uninitialized\n");
                lpc_ich_cells[LPC_GPIO].num_resources--;
                goto gpe0_done;
        }

-Aaron
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