[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>

1 files changed, 24 insertions, 9 deletions

diff --git a/arch/sparc64/kernel/pci_sun4v.c b/arch/sparc64/kernel/pci_sun4v.c
index 7055616e083..dc79b748fea 100644
--- 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;
 }