[PATCH -v3 3/3] pci: don't allocate from a BUSY bus resource

[Yinghai <yinghai.lu@oracle.com>]

  Drivers typically use pci_request_regions() to reserve the resources
  they use, but that fails if the resource is already busy.  Therefore,
  we should ignore busy resources when we're assigning resources to a
  device.

[commit log is from Bjorn]

Tested-by: Andy Isaacson <adi@hexapodia.org>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Acked-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>

---
 drivers/pci/bus.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: linux-2.6/drivers/pci/bus.c
===================================================================
--- linux-2.6.orig/drivers/pci/bus.c
+++ linux-2.6/drivers/pci/bus.c
@@ -103,6 +103,10 @@ pci_bus_alloc_resource(struct pci_bus *b
 		if (!r)
 			continue;
 
+		/* Driver can not reserve it later, so don't use it */
+		if (r->flags & IORESOURCE_BUSY)
+			continue;
+
 		/* type_mask must match */
 		if ((res->flags ^ r->flags) & type_mask)
 			continue;