[PATCH] yenta: fix parent resource determination

If the CardBus windows were pre-configured and the CardBus bridge is behind a
transparent PCI-PCI bridge, pci_find_parent_resource() might return a
different resource than the real parent if it is called before the window is
determined.  Therefore, move that call around.

Also fix return of value in void function.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 9 insertions, 11 deletions

diff --git a/drivers/pcmcia/yenta_socket.c b/drivers/pcmcia/yenta_socket.c
index 0e7aa8176692..5e0a9980d2fc 100644
--- a/drivers/pcmcia/yenta_socket.c
+++ b/drivers/pcmcia/yenta_socket.c
@@ -551,7 +551,7 @@ static void yenta_allocate_res(struct yenta_socket *socket, int nr, unsigned typ
         res = socket->dev->resource + PCI_BRIDGE_RESOURCES + nr;
         /* Already allocated? */
         if (res->parent)
-                return 0;
+                return;
 
         /* The granularity of the memory limit is 4kB, on IO it's 4 bytes */
         mask = ~0xfff;
@@ -562,25 +562,23 @@ static void yenta_allocate_res(struct yenta_socket *socket, int nr, unsigned typ
         bus = socket->dev->subordinate;
         res->name = bus->name;
         res->flags = type;
-        res->start = 0;
-        res->end = 0;
-        root = pci_find_parent_resource(socket->dev, res);
-
-        if (!root)
-                return;
 
         start = config_readl(socket, offset) & mask;
         end = config_readl(socket, offset+4) | ~mask;
         if (start && end > start && !override_bios) {
                 res->start = start;
                 res->end = end;
-                if (request_resource(root, res) == 0)
+                root = pci_find_parent_resource(socket->dev, res);
+                if (root && (request_resource(root, res) == 0))
                         return;
-                printk(KERN_INFO "yenta %s: Preassigned resource %d busy, reconfiguring...\n",
+                printk(KERN_INFO "yenta %s: Preassigned resource %d busy or not available, reconfiguring...\n",
                                 pci_name(socket->dev), nr);
-                res->start = res->end = 0;
         }
 
+        res->start = 0;
+        res->end = 0;
+        root = pci_find_parent_resource(socket->dev, res);
+
         if (type & IORESOURCE_IO) {
                 align = 1024;
                 size = BRIDGE_IO_MAX;
@@ -629,7 +627,7 @@ static void yenta_allocate_resources(struct yenta_socket *socket)
         yenta_allocate_res(socket, 0, IORESOURCE_MEM|IORESOURCE_PREFETCH);
         yenta_allocate_res(socket, 1, IORESOURCE_MEM);
         yenta_allocate_res(socket, 2, IORESOURCE_IO);
-        yenta_allocate_res(socket, 3, IORESOURCE_IO);   /* PCI isn't clever enough to use this one yet */
+        yenta_allocate_res(socket, 3, IORESOURCE_IO);
 }