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Subject[PATCH] - restore i8259A eoi status on resume
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>

diff --git a/arch/i386/kernel/i8259.c b/arch/i386/kernel/i8259.c
index 323ef8a..41485c7 100644
--- a/arch/i386/kernel/i8259.c
+++ b/arch/i386/kernel/i8259.c
@@ -46,6 +46,8 @@ static void end_8259A_irq (unsigned int

#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)
@@ -254,7 +256,7 @@ 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;
}
@@ -302,6 +304,8 @@ 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 */
diff --git a/arch/x86_64/kernel/i8259.c b/arch/x86_64/kernel/i8259.c
index 5ecd34a..75f77da 100644
--- a/arch/x86_64/kernel/i8259.c
+++ b/arch/x86_64/kernel/i8259.c
@@ -129,6 +129,8 @@ #undef IRQLIST_14

DEFINE_SPINLOCK(i8259A_lock);

+static int i8259A_auto_eoi;
+
static void end_8259A_irq (unsigned int irq)
{
if (irq > 256) {
@@ -342,6 +344,8 @@ 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 */
@@ -400,7 +404,7 @@ 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;
}

--
Matthew Garrett | mjg59@srcf.ucam.org
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