1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index ff9f6226085..8044583f303 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1357,6 +1357,9 @@ int acpi_bus_start(struct acpi_device *device)
 {
         struct acpi_bus_ops ops;
 
+        if (!device)
+                return -EINVAL;
+
         memset(&ops, 0, sizeof(ops));
         ops.acpi_op_start = 1;