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pci: move check for existing devfn into new pci_bus_devfn_available() helper 

Also touch up the logic in do_pci_register_device() accordingly.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Mark Cave-Ayland 2017-07-16 21:27:33 +01:00 committed by Michael S. Tsirkin
parent c8389550de
commit 9b717a3a13
1 changed files with 8 additions and 2 deletions
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10
hw/pci/pci.c
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@ -953,6 +953,11 @@ uint16_t pci_requester_id(PCIDevice *dev)
return pci_req_id_cache_extract(&dev->requester_id_cache);
}
static bool pci_bus_devfn_available(PCIBus *bus, int devfn)
{
return !(bus->devices[devfn]);
}
/* -1 for devfn means auto assign */
static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus,
const char *name, int devfn,
@ -976,14 +981,15 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus,
if (devfn < 0) {
for(devfn = bus->devfn_min ; devfn < ARRAY_SIZE(bus->devices);
devfn += PCI_FUNC_MAX) {
if (!bus->devices[devfn])
if (pci_bus_devfn_available(bus, devfn)) {
goto found;
}
}
error_setg(errp, "PCI: no slot/function available for %s, all in use",
name);
return NULL;
found: ;
} else if (bus->devices[devfn]) {
} else if (!pci_bus_devfn_available(bus, devfn)) {
error_setg(errp, "PCI: slot %d function %d not available for %s,"
" in use by %s",
PCI_SLOT(devfn), PCI_FUNC(devfn), name,