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| author | Eric W. Biederman <ebiederm@xmission.com> | 2005-06-25 23:57:43 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-26 01:24:46 +0200 |
| commit | cee5dab4856f51c5cad3aecc630ad0a4d2217a85 (patch) | |
| tree | 5798e045caf95519093d69609d7b8d2b20af4175 | |
| parent | [PATCH] kexec: x86_64: e820 64bit fix (diff) | |
| download | linux-cee5dab4856f51c5cad3aecc630ad0a4d2217a85.tar.xz linux-cee5dab4856f51c5cad3aecc630ad0a4d2217a85.zip | |
[PATCH] kexec: x86: i8259 shutdown: disable interrupts
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>
| -rw-r--r-- | arch/i386/kernel/i8259.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/i386/kernel/i8259.c b/arch/i386/kernel/i8259.c index 2c4813b47e57..178f4e9bac9d 100644 --- a/arch/i386/kernel/i8259.c +++ b/arch/i386/kernel/i8259.c @@ -268,10 +268,22 @@ static int i8259A_suspend(struct sys_device *dev, pm_message_t state) 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 = { set_kset_name("i8259"), .suspend = i8259A_suspend, .resume = i8259A_resume, + .shutdown = i8259A_shutdown, }; static struct sys_device device_i8259A = { |