sparc64: Fix overly strict range type matching for PCI devices.

When we are trying to see if a range property entry applies
to a given address, we are overly strict about the type.

We should only allow I/O ranges for I/O addresses, and only allow
CONFIG space ranges for CONFIG space address.

However for MEM ranges, they come in 32-bit and 64-bit flavors.
And a lack of an exact match is OK if the range is 32-bit and
the address is 64-bit.  We can assign a 64-bit address properly
into a 32-bit parent range just fine.

So allow it.

Reported-by: Patrick Finnegan <pat@computer-refuge.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc/kernel/of_device_64.c b/arch/sparc/kernel/of_device_64.c
index 881947e..0a6f2d1 100644 (file)
--- a/arch/sparc/kernel/of_device_64.c
+++ b/arch/sparc/kernel/of_device_64.c
@@ -104,9 +104,19 @@ static int of_bus_pci_map(u32 *addr, const u32 *range,
        int i;
 
        /* Check address type match */
-       if ((addr[0] ^ range[0]) & 0x03000000)
-               return -EINVAL;
+       if (!((addr[0] ^ range[0]) & 0x03000000))
+               goto type_match;
+
+       /* Special exception, we can map a 64-bit address into
+        * a 32-bit range.
+        */
+       if ((addr[0] & 0x03000000) == 0x03000000 &&
+           (range[0] & 0x03000000) == 0x02000000)
+               goto type_match;
+
+       return -EINVAL;
 
+type_match:
        if (of_out_of_range(addr + 1, range + 1, range + na + pna,
                            na - 1, ns))
                return -EINVAL;