s390/pci: Handling multifunctions

We allow multiple functions on a single bus.
We suppress the ZPCI_DEVFN definition and replace its
occurences with zpci->devfn.

We verify the number of device during the registration.

There can never be more domains in use than existing
devices, so we do not need to verify the count of domain
after having verified the count of devices.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/arch/s390/pci/pci_bus.h b/arch/s390/pci/pci_bus.h
index c6aff42cc2cf..89be3c354b7b 100644
--- a/arch/s390/pci/pci_bus.h
+++ b/arch/s390/pci/pci_bus.h
@@ -22,9 +22,10 @@ void zpci_free_domain(int domain);
 int zpci_setup_bus_resources(struct zpci_dev *zdev,
 			     struct list_head *resources);
 
-static inline struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
+static inline struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus,
+					       unsigned int devfn)
 {
 	struct zpci_bus *zbus = bus->sysdata;
 
-	return zbus->function[ZPCI_DEVFN];
+	return (devfn >= ZPCI_FUNCTIONS_PER_BUS) ? NULL : zbus->function[devfn];
 }