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PCI: Assign resources before drivers claim devices (pci_scan_bus())

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Previously, pci_scan_bus() created a root PCI bus, enumerated the devices
on it, and called pci_bus_add_devices(), which made the devices available
for drivers to claim them.

Most callers assigned resources to devices after pci_scan_bus() returns,
which may be after drivers have claimed the devices.  This is incorrect;
the PCI core should not change device resources while a driver is managing
the device.

Remove pci_bus_add_devices() from pci_scan_bus() and do it after any
resource assignment in the callers.

[bhelgaas: changelog, check for failure in mcf_pci_init()]
Signed-off-by: Yijing Wang <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
CC: "David S. Miller" <[email protected]>
CC: Geert Uytterhoeven <[email protected]>
CC: Guan Xuetao <[email protected]>
CC: Richard Henderson <[email protected]>
CC: Ivan Kokshaysky <[email protected]>
CC: Matt Turner <[email protected]>
This commit is contained in:
Yijing Wang 2015-03-09 10:33:58 +08:00 • committed by Bjorn Helgaas
commit c90570d951
6 changed files with 19 additions and 11 deletions
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4
arch/alpha/kernel/sys_nautilus.c
View file

@ -207,6 +207,9 @@ nautilus_init_pci(void)
/* Scan our single hose. */
bus = pci_scan_bus(0, alpha_mv.pci_ops, hose);
if (!bus)
return;
hose->bus = bus;
pcibios_claim_one_bus(bus);
@ -253,6 +256,7 @@ nautilus_init_pci(void)
for the root bus, so just clear it. */
bus->self = NULL;
pci_fixup_irqs(alpha_mv.pci_swizzle, alpha_mv.pci_map_irq);
pci_bus_add_devices(bus);
}
/*