acer-wmi - Fail gracefully if ACPI is disabled
From: Carlos Corbacho <carlos@xxxxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxxx>
CC: Ingo Molnar <mingo@xxxxxxx>
CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
CC: Len Brown <lenb@xxxxxxxxxx>
---
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);
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