ACPI: fix Supermicro X7DB8+ Boot regression

http://bugzilla.kernel.org/show_bug.cgi?id=7695

Originally we converted bind/unbind to use a new pci bridge driver.
The driver will add/remove _PRT, so we can eventually remove
.bind/.unbind methods.

But we found that some of the _ADR-Based devices don't have _PRT,
i.e. they are not managed by the new ACPI PCI bridge driver.
So that .bind method is not called for some _ADR-Based devices,
which leads to a failure.

Now we make ACPI PCI Root Bridge Driver scan and binds all _ADR-Based devices
once the driver is loaded, in the .add method of ACPI PCI Root Bridge driver.

Extra code path for calling .bind/.unbind when _ADR-Based devices
are hot added/removed is also added.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 9cfc74192419..2e1a74a967bb 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -151,6 +151,21 @@ static acpi_status try_get_root_bridge_busnr(acpi_handle handle, int *busnum)
         return AE_OK;
 }
 
+static void acpi_pci_bridge_scan(struct acpi_device *device)
+{
+        int status;
+        struct acpi_device *child = NULL;
+
+        if (device->flags.bus_address)
+                if (device->parent && device->parent->ops.bind) {
+                        status = device->parent->ops.bind(device);
+                        if (!status) {
+                                list_for_each_entry(child, &device->children, node)
+                                        acpi_pci_bridge_scan(child);
+                        }
+                }
+}
+
 static int acpi_pci_root_add(struct acpi_device *device)
 {
         int result = 0;
@@ -159,6 +174,7 @@ static int acpi_pci_root_add(struct acpi_device *device)
         acpi_status status = AE_OK;
         unsigned long value = 0;
         acpi_handle handle = NULL;
+        struct acpi_device *child;
 
 
         if (!device)
@@ -175,6 +191,8 @@ static int acpi_pci_root_add(struct acpi_device *device)
         strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
         acpi_driver_data(device) = root;
 
+        device->ops.bind = acpi_pci_bind;
+
         /* 
          * Segment
          * -------
@@ -294,6 +312,12 @@ static int acpi_pci_root_add(struct acpi_device *device)
                 result = acpi_pci_irq_add_prt(device->handle, root->id.segment,
                                               root->id.bus);
 
+        /*
+         * Scan and bind all _ADR-Based Devices
+         */
+        list_for_each_entry(child, &device->children, node)
+                acpi_pci_bridge_scan(child);
+
       end:
         if (result) {
                 if (!list_empty(&root->node))