[Intel-gfx] [PATCH] ACPI button: don't try to use a non-existent lid device

[Jesse Barnes]

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 at virtuousgeek.org>
---
 drivers/acpi/button.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
index 9335b87..0c9c6a9 100644
--- 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))
-- 
1.6.3.3