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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 bfb0b2280df0..06b10fe7e65b 100644
--- a/drivers/input/serio/i8042.c
+++ b/drivers/input/serio/i8042.c
@@ -1484,6 +1484,22 @@ 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;
@@ -1491,6 +1507,12 @@ 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;
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