[SPARC64]: Range check bus number in SUN4V PCI controller driver.

It has to be somewhere in the range from pbm->pci_first_busno to
pbm->pci_last_busno, inclusive.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc64/kernel/pci_sun4v.c b/arch/sparc64/kernel/pci_sun4v.c
index 7055616..dc79b74 100644 (file)
--- a/arch/sparc64/kernel/pci_sun4v.c
+++ b/arch/sparc64/kernel/pci_sun4v.c
@@ -514,19 +514,31 @@ struct pci_iommu_ops pci_sun4v_iommu_ops = {
 
 /* SUN4V PCI configuration space accessors. */
 
+static inline int pci_sun4v_out_of_range(struct pci_pbm_info *pbm, unsigned int bus)
+{
+       if (bus < pbm->pci_first_busno ||
+           bus > pbm->pci_last_busno)
+               return 1;
+       return 0;
+}
+
 static int pci_sun4v_read_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
                                  int where, int size, u32 *value)
 {
        struct pci_pbm_info *pbm = bus_dev->sysdata;
-       unsigned long devhandle = pbm->devhandle;
+       u32 devhandle = pbm->devhandle;
        unsigned int bus = bus_dev->number;
        unsigned int device = PCI_SLOT(devfn);
        unsigned int func = PCI_FUNC(devfn);
        unsigned long ret;
 
-       ret = pci_sun4v_config_get(devhandle,
-                                  HV_PCI_DEVICE_BUILD(bus, device, func),
-                                  where, size);
+       if (pci_sun4v_out_of_range(pbm, bus)) {
+               ret = ~0UL;
+       } else {
+               ret = pci_sun4v_config_get(devhandle,
+                               HV_PCI_DEVICE_BUILD(bus, device, func),
+                               where, size);
+       }
        switch (size) {
        case 1:
                *value = ret & 0xff;
@@ -547,16 +559,19 @@ static int pci_sun4v_write_pci_cfg(struct pci_bus *bus_dev, unsigned int devfn,
                                   int where, int size, u32 value)
 {
        struct pci_pbm_info *pbm = bus_dev->sysdata;
-       unsigned long devhandle = pbm->devhandle;
+       u32 devhandle = pbm->devhandle;
        unsigned int bus = bus_dev->number;
        unsigned int device = PCI_SLOT(devfn);
        unsigned int func = PCI_FUNC(devfn);
        unsigned long ret;
 
-       ret = pci_sun4v_config_put(devhandle,
-                                  HV_PCI_DEVICE_BUILD(bus, device, func),
-                                  where, size, value);
-
+       if (pci_sun4v_out_of_range(pbm, bus)) {
+               /* Do nothing. */
+       } else {
+               ret = pci_sun4v_config_put(devhandle,
+                               HV_PCI_DEVICE_BUILD(bus, device, func),
+                               where, size, value);
+       }
        return PCIBIOS_SUCCESSFUL;
 }