[PATCH] acpi bridge hotadd: Fix pci_enable_device() for p2p bridges (fab3fb0a) · Commits · 戴 / test

When checking if a PCI to PCI bridge should be enabled to decode memory and/or IO resources, we need to look at all device resources not just the first 6. This is needed to allow PCI bridges to pass down memory and IO accesses to child devices even when the bridge itself does not consume resources in its PCI BARs. Signed-off-by:

Rajesh Shah <rajesh.shah@intel.com> Signed-off-by:

Andrew Morton <akpm@osdl.org> Signed-off-by:

Greg Kroah-Hartman <gregkh@suse.de>

arch/ia64/pci/pci.c

+7 −3

Original line number	Diff line number	Diff line
		@@ -418,18 +418,24 @@ pcibios_enable_resources (struct pci_dev *dev, int mask)
		u16 cmd, old_cmd;
		int idx;
		struct resource *r;
		unsigned long type_mask = IORESOURCE_IO \| IORESOURCE_MEM;

		if (!dev)
		return -EINVAL;

		pci_read_config_word(dev, PCI_COMMAND, &cmd);
		old_cmd = cmd;
		for (idx=0; idx<6; idx++) {
		for (idx=0; idx<PCI_NUM_RESOURCES; idx++) {
		/* Only set up the desired resources. */
		if (!(mask & (1 << idx)))
		continue;

		r = &dev->resource[idx];
		if (!(r->flags & type_mask))
		continue;
		if ((idx == PCI_ROM_RESOURCE) &&
		(!(r->flags & IORESOURCE_ROM_ENABLE)))
		continue;
		if (!r->start && r->end) {
		printk(KERN_ERR
		"PCI: Device %s not available because of resource collisions\n",
		@@ -441,8 +447,6 @@ pcibios_enable_resources (struct pci_dev *dev, int mask)
		if (r->flags & IORESOURCE_MEM)
		cmd \|= PCI_COMMAND_MEMORY;
		}
		if (dev->resource[PCI_ROM_RESOURCE].start)
		cmd \|= PCI_COMMAND_MEMORY;
		if (cmd != old_cmd) {
		printk("PCI: Enabling device %s (%04x -> %04x)\n", pci_name(dev), old_cmd, cmd);
		pci_write_config_word(dev, PCI_COMMAND, cmd);

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