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powerpc/pci: Don't scan empty slot
In hotplug case, function pci_add_pci_devices() is called to rescan the specified PCI bus, which might not have any child devices. Access to the PCI bus's child device node will cause kernel crash without exception. This adds one more check to skip scanning PCI bus that doesn't have any subordinate devices from device-tree, in order to avoid kernel crash. Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com> Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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1 changed files with 2 additions and 1 deletions
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@ -120,7 +120,8 @@ void pci_hp_add_devices(struct pci_bus *bus)
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if (mode == PCI_PROBE_DEVTREE) {
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/* use ofdt-based probe */
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of_rescan_bus(dn, bus);
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} else if (mode == PCI_PROBE_NORMAL) {
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} else if (mode == PCI_PROBE_NORMAL &&
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dn->child && PCI_DN(dn->child)) {
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/*
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* Use legacy probe. In the partial hotplug case, we
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* probably have grandchildren devices unplugged. So
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