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[PATCH] x86: - restore i8259A eoi status on resume

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Got it. i8259A_resume calls init_8259A(0) unconditionally, even if
auto_eoi has been set. Keep track of the current status and restore that
on resume. This fixes it for AMD64 and i386.

Signed-off-by: Matthew Garrett <mjg59@srcf.ucam.org>
Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Matthew Garrett 2006-09-26 10:52:41 +02:00 committed by Andi Kleen
parent f354b3a92a
commit 35d534a3ff
2 changed files with 10 additions and 2 deletions
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6
arch/i386/kernel/i8259.c
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@ -45,6 +45,8 @@ static void end_8259A_irq (unsigned int irq)
#define shutdown_8259A_irq disable_8259A_irq
static int i8259A_auto_eoi;
static void mask_and_ack_8259A(unsigned int);
unsigned int startup_8259A_irq(unsigned int irq)
@ -253,7 +255,7 @@ static void save_ELCR(char *trigger)
static int i8259A_resume(struct sys_device *dev)
{
init_8259A(0);
init_8259A(i8259A_auto_eoi);
restore_ELCR(irq_trigger);
return 0;
}
@ -301,6 +303,8 @@ void init_8259A(int auto_eoi)
{
unsigned long flags;
i8259A_auto_eoi = auto_eoi;
spin_lock_irqsave(&i8259A_lock, flags);
outb(0xff, PIC_MASTER_IMR); /* mask all of 8259A-1 */

6
arch/x86_64/kernel/i8259.c
View File

@ -123,6 +123,8 @@ void (*interrupt[NR_IRQS])(void) = {
DEFINE_SPINLOCK(i8259A_lock);
static int i8259A_auto_eoi;
static void end_8259A_irq (unsigned int irq)
{
if (irq > 256) {
@ -336,6 +338,8 @@ void init_8259A(int auto_eoi)
{
unsigned long flags;
i8259A_auto_eoi = auto_eoi;
spin_lock_irqsave(&i8259A_lock, flags);
outb(0xff, 0x21); /* mask all of 8259A-1 */
@ -394,7 +398,7 @@ static void save_ELCR(char *trigger)
static int i8259A_resume(struct sys_device *dev)
{
init_8259A(0);
init_8259A(i8259A_auto_eoi);
restore_ELCR(irq_trigger);
return 0;
}