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

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Date:	Mon, 11 Feb 2008 19:55:03 +0000
From:	Carlos Corbacho <carlos@...angeworlds.co.uk>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Len Brown <lenb@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pm@...ts.linux-foundation.org
Subject: [PATCH 1/2] acer-wmi - Fail gracefully if ACPI is disabled

acer-wmi - Fail gracefully if ACPI is disabled

From: Carlos Corbacho <carlos@...angeworlds.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@...angeworlds.co.uk>
CC: Ingo Molnar <mingo@...e.hu>
CC: Linus Torvalds <torvalds@...ux-foundation.org>
CC: Andrew Morton <akpm@...ux-foundation.org>
CC: Len Brown <lenb@...nel.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);
 
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