From: Bastien Nocera <hadess@hadess.net>

Date: Thu, 20 May 2010 10:30:31 -0400

Subject: [PATCH] disable i8042 check on apple mac

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

Bugzilla: N/A

Upstream-status: http://lkml.indiana.edu/hypermail/linux/kernel/1005.0/00938.html (and pinged on Dec 17, 2013)

Signed-off-by: Bastien Nocera <hadess@hadess.net>

---

 drivers/input/serio/i8042.c | 22 ++++++++++++++++++++++

 1 file changed, 22 insertions(+)

diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c

index 739f57b35fa3..8af45db27310 100644

--- a/drivers/input/serio/i8042.c

+++ b/drivers/input/serio/i8042.c

@@ -1485,6 +1485,22 @@ static struct platform_driver i8042_driver = {

 	.shutdown	= i8042_shutdown,

 };

+#ifdef CONFIG_DMI

+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.")

+		},

+	},

+	{}

+};

+#endif /*CONFIG_DMI*/

+

 static int __init i8042_init(void)

 {

 	struct platform_device *pdev;

@@ -1492,6 +1508,12 @@ static int __init i8042_init(void)

 	dbg_init();

+#ifdef CONFIG_DMI

+	/* Intel Apple Macs never have an i8042 controller */

+	if (dmi_check_system(dmi_system_table) > 0)

+		return -ENODEV;

+#endif /*CONFIG_DMI*/

+

 	err = i8042_platform_init();

 	if (err)

 		return err;

-- 

2.1.0