From: Bastien Nocera 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 --- 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 9bb95eab6926..4b5015f27f9e 100644 --- a/drivers/input/serio/i8042.c +++ b/drivers/input/serio/i8042.c @@ -1471,6 +1471,22 @@ 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; @@ -1478,6 +1494,12 @@ 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