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Commit cc57450f authored by Rajesh Shah's avatar Rajesh Shah Committed by Greg Kroah-Hartman
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[PATCH] acpi bridge hotadd: Prevent duplicate bus numbers when scanning PCI bridge 



When hot-plugging a root bridge, as we try to assign bus numbers we may find
that the hotplugged hieratchy has more PCI to PCI bridges (i.e.  bus
requirements) than available.  Make sure we don't step over an existing bus
when that happens.

Signed-off-by: default avatarRajesh Shah <rajesh.shah@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 71c3511c

drivers/pci/probe.c

+10 −2
Original line number Diff line number Diff line
@@ -411,7 +411,7 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max 
{

	struct pci_bus *child;

	int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);

	u32 buses;

	u32 buses, i;

	u16 bctl;



	pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
@@ -470,6 +470,10 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max 
		/* Clear errors */

		pci_write_config_word(dev, PCI_STATUS, 0xffff);



		/* Prevent assigning a bus number that already exists.

		 * This can happen when a bridge is hot-plugged */

		if (pci_find_bus(pci_domain_nr(bus), max+1))

			return max;

		child = pci_alloc_child_bus(bus, dev, ++max);

		buses = (buses & 0xff000000)

		      | ((unsigned int)(child->primary)     <<  0)
@@ -501,7 +505,11 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max 
			 * as cards with a PCI-to-PCI bridge can be

			 * inserted later.

			 */

			max += CARDBUS_RESERVE_BUSNR;

			for (i=0; i<CARDBUS_RESERVE_BUSNR; i++)

				if (pci_find_bus(pci_domain_nr(bus),

							max+i+1))

					break;

			max += i;

		}

		/*

		 * Set the subordinate bus number to its real value.