ACPI / PCI root: Clear driver_data before failing enumeration

If a PCI host bridge cannot be enumerated due to an error in
pci_acpi_scan_root(), its ACPI device object's driver_data field
has to be cleared by acpi_pci_root_add() before freeing the
object pointed to by that field, or some later acpi_pci_find_root()
checks that should fail may succeed and cause quite a bit of
confusion to ensue.

Fix acpi_pci_root_add() to clear device->driver_data before
returning an error code as appropriate.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Toshi Kani <toshi.kani@hp.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 417876bce854..b5cb729328a4 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -525,6 +525,7 @@ static int acpi_pci_root_add(struct acpi_device *device,
                 dev_err(&device->dev,
                         "Bus %04x:%02x not present in PCI namespace\n",
                         root->segment, (unsigned int)root->secondary.start);
+                device->driver_data = NULL;
                 result = -ENODEV;
                 goto end;
         }