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

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Date:	Thu, 19 Mar 2009 11:11:42 -0600
From:	Alex Chiang <achiang@...com>
To:	Andrew Morton <akpm@...ux-foundation.org>
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()

* Andrew Morton <akpm@...ux-foundation.org>:
> 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

Ok, will figure out (a) or (b).

Thanks.

/ac

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