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[PATCH] kexec: x86: i8259 shutdown: disable interrupts

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From: Eric W. Biederman <ebiederm@xmission.com>

This patch disables interrupt generation from the legacy pic on reboot.  Now
that there is a sys_device class it should not be called while drivers are
still using interrupts.

There is a report about this breaking ACPI power off on some systems.
http://bugme.osdl.org/show_bug.cgi?id=4041
However the final comment seems to exonerate this code.  So until
I get more information I believe that was a false positive.

Signed-off-by: Eric Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Eric W. Biederman 2005-06-25 14:57:43 -07:00 committed by Linus Torvalds
parent 70adada428
commit cee5dab485
1 changed files with 12 additions and 0 deletions
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12
arch/i386/kernel/i8259.c
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@ -268,10 +268,22 @@ static int i8259A_suspend(struct sys_device *dev, pm_message_t state)
return 0; return 0;
} }
static int i8259A_shutdown(struct sys_device *dev)
{
/* Put the i8259A into a quiescent state that
* the kernel initialization code can get it
* out of.
*/
outb(0xff, 0x21); /* mask all of 8259A-1 */
outb(0xff, 0xA1); /* mask all of 8259A-1 */
return 0;
}
static struct sysdev_class i8259_sysdev_class = { static struct sysdev_class i8259_sysdev_class = {
set_kset_name("i8259"), set_kset_name("i8259"),
.suspend = i8259A_suspend, .suspend = i8259A_suspend,
.resume = i8259A_resume, .resume = i8259A_resume,
.shutdown = i8259A_shutdown,
}; };
static struct sys_device device_i8259A = { static struct sys_device device_i8259A = {