From: Jesse Barnes <jbarnes@virtuousgeek.org>
Date: Wed, 7 Oct 2009 21:39:46 +0000 (-0700)
Subject: ACPI button: don't try to use a non-existent lid device
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=2c907b72db4dd4e8af6dccb6e0ac122d78627b8d;p=deliverable%2Flinux.git

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>
---

diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
index 9335b87c5174..0c9c6a9a002c 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))