linux-kernel - Re: [PATCH v4 06/12] PCI: Introduce pci_rescan

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Date:	Thu, 19 Mar 2009 02:29:56 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Alex Chiang <achiang@...com>
Cc:	jbarnes@...tuousgeek.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 06/12] PCI: Introduce pci_rescan_bus()

On Wed, 18 Mar 2009 16:39:56 -0600 Alex Chiang <achiang@...com> wrote:

> +/**
> + * pci_rescan_bus - scan a PCI bus for devices.
> + * @bus: PCI bus to scan
> + *
> + * Scan a PCI bus and child buses for new devices, adds them,
> + * and enables them.
> + *
> + * Returns the max number of subordinate bus discovered.
> + */
> +unsigned int __devinit pci_rescan_bus(struct pci_bus *bus)
> +{
> +	unsigned int max;
> +	struct pci_dev *dev;
> +
> +	max = pci_scan_child_bus(bus);
> +	list_for_each_entry(dev, &bus->devices, bus_list)
> +		if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
> +		    dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
> +			if (dev->subordinate)
> +				pci_bus_size_bridges(dev->subordinate);
> +
> +	pci_bus_assign_resources(bus);
> +	pci_enable_bridges(bus);
> +	pci_bus_add_devices(bus);
> +
> +	return max;
> +}

The conspicuous lack of locking for the list walk requires either

a) documenting or
b) fixing

IMO.
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