ACPI button: don't try to use a non-existent lid device

If a call comes in to check the lid state but there's no lid device present, we should return -ENODEV. Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Len Brown <len.brown@intel.com>
git-mirror · Oct 13, 2009 · 2c907b7 · 2c907b7
1 parent 2906206
commit 2c907b7
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
@@ -251,6 +251,9 @@ int acpi_lid_open(void)
 	acpi_status status;
 	unsigned long long state;
 
+	if (!lid_device)
+		return -ENODEV;
+
 	status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL,
 				       &state);
 	if (ACPI_FAILURE(status))