Fix cardbus resource allocation

Commit 884525655d07fdee9245716b998ecdc45cdd8007 ("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 <[e-mail]>
Cc: Ivan Kokshaysky <[e-mail]>
Cc: Jesse Barnes <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/pci/setup-bus.c

···
 	 * 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
···
 	 * 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;
 	}
 }