linux-kernel - [PATCH] Disable i8042 checks on Intel Apple Macs

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Message-ID: <1272994594.13354.215.camel@localhost.localdomain>
Date:	Tue, 04 May 2010 18:36:34 +0100
From:	Bastien Nocera <hadess@...ess.net>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: [PATCH] Disable i8042 checks on Intel Apple Macs

As those computers never had any i8042 controllers, and the
current lookup code could potentially lock up/hang/wait for
timeout for long periods of time.

Fixes intermittent hangs on boot on a MacbookAir1,1

Signed-off-by: Bastien Nocera <hadess@...ess.net>
---
 drivers/input/serio/i8042.c |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
index d84a36e..2be7207 100644
--- a/drivers/input/serio/i8042.c
+++ b/drivers/input/serio/i8042.c
@@ -1438,12 +1438,30 @@ static struct platform_driver i8042_driver = {
 	.shutdown	= i8042_shutdown,
 };
 
+static struct dmi_system_id __initdata dmi_system_table[] = {
+	{
+		.matches = {
+			DMI_MATCH(DMI_BIOS_VENDOR, "Apple Computer, Inc.")
+		},
+	},
+	{
+		.matches = {
+			DMI_MATCH(DMI_BIOS_VENDOR, "Apple Inc.")
+		},
+	},
+	{}
+};
+
 static int __init i8042_init(void)
 {
 	int err;
 
 	dbg_init();
 
+	/* Intel Apple Macs never have an i8042 controller */
+	if (dmi_check_system(dmi_system_table) > 0)
+		return -ENODEV;
+
 	err = i8042_platform_init();
 	if (err)
 		return err;
-- 
1.6.6



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