small PCI probe patch for odd 64 bit BARs

[Tim Hockin <thockin@google.com>]

The current PCI probe code breaks for 64 bit BARs that do not decode a
full 64 bits.  Example:

We have a device that uses a 64 bit BAR.  When you write all Fs to the
BARs, you get:

	000000ff ffff0000

It wants 64k, in the first TB of RAM.  The current code totally borks on
this.

Simple patch against 2.6.9:

Signed-Off-By: Tim Hockin <thockin@google.com>



--- drivers/pci/probe.c.orig	2004-11-10 20:42:03.000000000 -0800
+++ drivers/pci/probe.c	2004-11-10 20:42:07.000000000 -0800
@@ -144,9 +144,11 @@
 			pci_write_config_dword(dev, reg+4, ~0);
 			pci_read_config_dword(dev, reg+4, &sz);
 			pci_write_config_dword(dev, reg+4, l);
-			if (~sz)
-				res->end = res->start + 0xffffffff +
-						(((unsigned long) ~sz) << 32);
+			sz = pci_size(sz, 0xffffffff);
+			if (sz) {
+				/* this BAR needs > 4GB?  Wow. */
+				res->end |= (unsigned long)sz<<32;
+			}
 #else
 			if (l) {
 				printk(KERN_ERR "PCI: Unable to handle 64-bit address for device %s\n", pci_name(dev));