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| author | Bjorn Helgaas <bhelgaas@google.com> | 2011-10-29 00:25:45 +0200 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2012-01-06 21:10:51 +0100 |
| commit | 166c6370754a0a92386e2ffb0eeb06e50ac8588d (patch) | |
| tree | c9bbbf23a0508cd93d546ecbfdb9fcd423a1e461 | |
| parent | PCI: show host bridges and root bus resources (diff) | |
| download | linux-166c6370754a0a92386e2ffb0eeb06e50ac8588d.tar.xz linux-166c6370754a0a92386e2ffb0eeb06e50ac8588d.zip | |
PCI: add pci_create_root_bus() that accepts resource list
pci_create_bus() assigns ioport_resource and iomem_resource as the default
bus resources, i.e., the entire address space. Architectures fix these
later, typically in pcibios_fixup_bus() or after pci_scan_bus_parented()
returns, but code that runs in the interim sees incorrect resource
information.
This patch adds a new pci_create_root_bus() that sets the bus resources
correctly from a supplied list of resources.
I intend to remove pci_create_bus() after changing all callers.
Based on original patch by Deng-Cheng Zhu.
Reference: http://www.spinics.net/lists/mips/msg41654.html
Reference: https://lkml.org/lkml/2011/8/26/88
Signed-off-by: Deng-Cheng Zhu <dczhu@mips.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
| -rw-r--r-- | drivers/pci/probe.c | 25 | ||||
| -rw-r--r-- | include/linux/pci.h | 3 |
2 files changed, 24 insertions, 4 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 2f0b14451d9d..89ecded0581b 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1522,12 +1522,13 @@ unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus) return max; } -struct pci_bus * pci_create_bus(struct device *parent, - int bus, struct pci_ops *ops, void *sysdata) +struct pci_bus *pci_create_root_bus(struct device *parent, int bus, + struct pci_ops *ops, void *sysdata, struct list_head *resources) { int error, i; struct pci_bus *b, *b2; struct device *dev; + struct pci_bus_resource *bus_res, *n; struct resource *res; b = pci_alloc_bus(); @@ -1578,8 +1579,10 @@ struct pci_bus * pci_create_bus(struct device *parent, pci_create_legacy_files(b); b->number = b->secondary = bus; - b->resource[0] = &ioport_resource; - b->resource[1] = &iomem_resource; + + /* Add initial resources to the bus */ + list_for_each_entry_safe(bus_res, n, resources, list) + list_move_tail(&bus_res->list, &b->resources); if (parent) dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev)); @@ -1605,6 +1608,20 @@ err_out: return NULL; } +struct pci_bus *pci_create_bus(struct device *parent, + int bus, struct pci_ops *ops, void *sysdata) +{ + LIST_HEAD(resources); + struct pci_bus *b; + + pci_add_resource(&resources, &ioport_resource); + pci_add_resource(&resources, &iomem_resource); + b = pci_create_root_bus(parent, bus, ops, sysdata, &resources); + if (!b) + pci_free_resource_list(&resources); + return b; +} + struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent, int bus, struct pci_ops *ops, void *sysdata) { diff --git a/include/linux/pci.h b/include/linux/pci.h index 9daa79901122..eacb1e51e11b 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -670,6 +670,9 @@ static inline struct pci_bus * __devinit pci_scan_bus(int bus, struct pci_ops *o pci_bus_add_devices(root_bus); return root_bus; } +struct pci_bus *pci_create_root_bus(struct device *parent, int bus, + struct pci_ops *ops, void *sysdata, + struct list_head *resources); struct pci_bus *pci_create_bus(struct device *parent, int bus, struct pci_ops *ops, void *sysdata); struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, |