Fix cardbus resource allocation

Commit 8845256 ("PCI: clean up resource
alignment management") didn't set the alignment information for the
cardbus window resources, causing their subsequent allocations to fail
miserably with a message like

  yenta_cardbus 0000:15:00.0: device not available because of BAR 7 [100:1ff] collisions
  yenta_cardbus: probe of 0000:15:00.0 failed with error -16

or similar.

This fixes it and clarifies the code a bit too (we used to have to use
the insane PCI bridge alignment logic that put the alignment in the
"start" field, this makes it use the slightly easier-to-understand
size-based alignment, and allows us to set the resource start to zero
until it gets allocated).

Reported-and-tested-by: Jeff Chua <jeff.chua.linux@gmail.com>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/pci/setup-bus.c

@@ -416,13 +416,13 @@ static void pci_bus_size_cardbus(struct pci_bus *bus)
 	 * Reserve some resources for CardBus.  We reserve
 	 * a fixed amount of bus space for CardBus bridges.
 	 */
-	b_res[0].start = pci_cardbus_io_size;
-	b_res[0].end = b_res[0].start + pci_cardbus_io_size - 1;
-	b_res[0].flags |= IORESOURCE_IO;
+	b_res[0].start = 0;
+	b_res[0].end = pci_cardbus_io_size - 1;
+	b_res[0].flags |= IORESOURCE_IO | IORESOURCE_SIZEALIGN;
 
-	b_res[1].start = pci_cardbus_io_size;
-	b_res[1].end = b_res[1].start + pci_cardbus_io_size - 1;
-	b_res[1].flags |= IORESOURCE_IO;
+	b_res[1].start = 0;
+	b_res[1].end = pci_cardbus_io_size - 1;
+	b_res[1].flags |= IORESOURCE_IO | IORESOURCE_SIZEALIGN;
 
 	/*
 	 * Check whether prefetchable memory is supported
@@ -441,17 +441,17 @@ static void pci_bus_size_cardbus(struct pci_bus *bus)
 	 * twice the size.
 	 */
 	if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0) {
-		b_res[2].start = pci_cardbus_mem_size;
-		b_res[2].end = b_res[2].start + pci_cardbus_mem_size - 1;
-		b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH;
+		b_res[2].start = 0;
+		b_res[2].end = pci_cardbus_mem_size - 1;
+		b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH | IORESOURCE_SIZEALIGN;
 
-		b_res[3].start = pci_cardbus_mem_size;
-		b_res[3].end = b_res[3].start + pci_cardbus_mem_size - 1;
-		b_res[3].flags |= IORESOURCE_MEM;
+		b_res[3].start = 0;
+		b_res[3].end = pci_cardbus_mem_size - 1;
+		b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_SIZEALIGN;
 	} else {
-		b_res[3].start = pci_cardbus_mem_size * 2;
-		b_res[3].end = b_res[3].start + pci_cardbus_mem_size * 2 - 1;
-		b_res[3].flags |= IORESOURCE_MEM;
+		b_res[3].start = 0;
+		b_res[3].end = pci_cardbus_mem_size * 2 - 1;
+		b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_SIZEALIGN;
 	}
 }