Commit 47e3c904 authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Benjamin Herrenschmidt
Browse files

powerpc: Convert i8259_lock to raw_spinlock 



i8259_lock needs to be a real spinlock in RT. Convert it to
raw_spinlock.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 7cc8a5e3

arch/powerpc/sysdev/i8259.c

+11 −11
Original line number Diff line number Diff line
@@ -23,7 +23,7 @@ static unsigned char cached_8259[2] = { 0xff, 0xff }; 
#define cached_A1 (cached_8259[0])

#define cached_21 (cached_8259[1])



static DEFINE_SPINLOCK(i8259_lock);

static DEFINE_RAW_SPINLOCK(i8259_lock);



static struct irq_host *i8259_host;
@@ -42,7 +42,7 @@ unsigned int i8259_irq(void) 
	if (pci_intack)

		irq = readb(pci_intack);

	else {

		spin_lock(&i8259_lock);

		raw_spin_lock(&i8259_lock);

		lock = 1;



		/* Perform an interrupt acknowledge cycle on controller 1. */
@@ -74,7 +74,7 @@ unsigned int i8259_irq(void) 
		irq = NO_IRQ;



	if (lock)

		spin_unlock(&i8259_lock);

		raw_spin_unlock(&i8259_lock);

	return irq;

}
@@ -82,7 +82,7 @@ static void i8259_mask_and_ack_irq(unsigned int irq_nr) 
{

	unsigned long flags;



	spin_lock_irqsave(&i8259_lock, flags);

	raw_spin_lock_irqsave(&i8259_lock, flags);

	if (irq_nr > 7) {

		cached_A1 |= 1 << (irq_nr-8);

		inb(0xA1); 	/* DUMMY */
@@ -95,7 +95,7 @@ static void i8259_mask_and_ack_irq(unsigned int irq_nr) 
		outb(cached_21, 0x21);

		outb(0x20, 0x20);	/* Non-specific EOI */

	}

	spin_unlock_irqrestore(&i8259_lock, flags);

	raw_spin_unlock_irqrestore(&i8259_lock, flags);

}



static void i8259_set_irq_mask(int irq_nr)
@@ -110,13 +110,13 @@ static void i8259_mask_irq(unsigned int irq_nr) 


	pr_debug("i8259_mask_irq(%d)\n", irq_nr);



	spin_lock_irqsave(&i8259_lock, flags);

	raw_spin_lock_irqsave(&i8259_lock, flags);

	if (irq_nr < 8)

		cached_21 |= 1 << irq_nr;

	else

		cached_A1 |= 1 << (irq_nr-8);

	i8259_set_irq_mask(irq_nr);

	spin_unlock_irqrestore(&i8259_lock, flags);

	raw_spin_unlock_irqrestore(&i8259_lock, flags);

}



static void i8259_unmask_irq(unsigned int irq_nr)
@@ -125,13 +125,13 @@ static void i8259_unmask_irq(unsigned int irq_nr) 


	pr_debug("i8259_unmask_irq(%d)\n", irq_nr);



	spin_lock_irqsave(&i8259_lock, flags);

	raw_spin_lock_irqsave(&i8259_lock, flags);

	if (irq_nr < 8)

		cached_21 &= ~(1 << irq_nr);

	else

		cached_A1 &= ~(1 << (irq_nr-8));

	i8259_set_irq_mask(irq_nr);

	spin_unlock_irqrestore(&i8259_lock, flags);

	raw_spin_unlock_irqrestore(&i8259_lock, flags);

}



static struct irq_chip i8259_pic = {
@@ -241,7 +241,7 @@ void i8259_init(struct device_node *node, unsigned long intack_addr) 
	unsigned long flags;



	/* initialize the controller */

	spin_lock_irqsave(&i8259_lock, flags);

	raw_spin_lock_irqsave(&i8259_lock, flags);



	/* Mask all first */

	outb(0xff, 0xA1);
@@ -273,7 +273,7 @@ void i8259_init(struct device_node *node, unsigned long intack_addr) 
	outb(cached_A1, 0xA1);

	outb(cached_21, 0x21);



	spin_unlock_irqrestore(&i8259_lock, flags);

	raw_spin_unlock_irqrestore(&i8259_lock, flags);



	/* create a legacy host */

	i8259_host = irq_alloc_host(node, IRQ_HOST_MAP_LEGACY,