[PATCH 1/2] acer-wmi - Fail gracefully if ACPI is disabled

[Carlos Corbacho <carlos@strangeworlds.co.uk>]

acer-wmi - Fail gracefully if ACPI is disabled

From: Carlos Corbacho <carlos@strangeworlds.co.uk>

WMI drivers, like their ACPI counterparts, should also check if ACPI is
disabled or not, and bail out if so, otherwise we cause a crash.

Spotted by Ingo Molnar.

Signed-off-by: Carlos Corbacho <carlos@strangeworlds.co.uk>
CC: Ingo Molnar <mingo@elte.hu>
CC: Linus Torvalds <torvalds@linux-foundation.org>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Len Brown <lenb@kernel.org>
---

 drivers/misc/acer-wmi.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)


diff --git a/drivers/misc/acer-wmi.c b/drivers/misc/acer-wmi.c
index d7aea93..6e81027 100644
--- a/drivers/misc/acer-wmi.c
+++ b/drivers/misc/acer-wmi.c
@@ -1029,6 +1029,9 @@ static int __init acer_wmi_init(void)
 {
 	int err;
 
+	if (acpi_disabled)
+		return -ENODEV;
+
 	printk(ACER_INFO "Acer Laptop ACPI-WMI Extras version %s\n",
 			ACER_WMI_VERSION);