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PCI: Set up bridge resources earlier

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Bridge windows are read twice from PCI Config Space, the first time from
pci_read_bridge_windows(), which does not set up the device's resources.
This causes problems down the road as child resources of the bridge cannot
check whether they reside within the bridge window or not.

Set up the bridge windows already in pci_read_bridge_windows().

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20250924134228.1663-2-ilpo.jarvinen@linux.intel.com
This commit is contained in:
Ilpo Järvinen
2025-09-24 16:42:27 +03:00
committed by Bjorn Helgaas
parent 15c5867b0a
commit a43ac325c7
1 changed files with 10 additions and 3 deletions
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13
drivers/pci/probe.c
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@@ -537,10 +537,14 @@ static void pci_read_bridge_windows(struct pci_dev *bridge)
}
if (io) {
bridge->io_window = 1;
pci_read_bridge_io(bridge, &res, true);
pci_read_bridge_io(bridge,
pci_resource_n(bridge, PCI_BRIDGE_IO_WINDOW),
true);
}
pci_read_bridge_mmio(bridge, &res, true);
pci_read_bridge_mmio(bridge,
pci_resource_n(bridge, PCI_BRIDGE_MEM_WINDOW),
true);
/*
* DECchip 21050 pass 2 errata: the bridge may miss an address
@@ -578,7 +582,10 @@ static void pci_read_bridge_windows(struct pci_dev *bridge)
bridge->pref_64_window = 1;
}
pci_read_bridge_mmio_pref(bridge, &res, true);
pci_read_bridge_mmio_pref(bridge,
pci_resource_n(bridge,
PCI_BRIDGE_PREF_MEM_WINDOW),
true);
}
void pci_read_bridge_bases(struct pci_bus *child)