diff --git a/include/linux/irq.h b/include/linux/irq.h
index e32b64ccdc89f33e19fa110a4597d318738ccc76..d1f9c352cd1be113156a97ccd0008ec24518282a 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -54,7 +54,6 @@ typedef	void (*irq_flow_handler_t)(unsigned int irq,
 #define IRQ_DISABLED		0x00000200	/* IRQ disabled - do not enter! */
 #define IRQ_PENDING		0x00000400	/* IRQ pending - replay on enable */
 #define IRQ_REPLAY		0x00000800	/* IRQ has been replayed but not acked yet */
-#define IRQ_AUTODETECT		0x00001000	/* IRQ is being autodetected */
 #define IRQ_WAITING		0x00002000	/* IRQ not yet seen - for autodetection */
 #define IRQ_LEVEL		0x00004000	/* IRQ level triggered */
 #define IRQ_MASKED		0x00008000	/* IRQ masked - shouldn't be seen again */
diff --git a/kernel/irq/autoprobe.c b/kernel/irq/autoprobe.c
index 08947cb617258a78a7b5272ced4d1d9c345a7c6a..916e56e10a2e58e827ba851add2b46d285c67b76 100644
--- a/kernel/irq/autoprobe.c
+++ b/kernel/irq/autoprobe.c
@@ -32,7 +32,6 @@ unsigned long probe_irq_on(void)
 {
 	struct irq_desc *desc;
 	unsigned long mask = 0;
-	unsigned int status;
 	int i;
 
 	/*
@@ -76,7 +75,8 @@ unsigned long probe_irq_on(void)
 	for_each_irq_desc_reverse(i, desc) {
 		raw_spin_lock_irq(&desc->lock);
 		if (!desc->action && !(desc->status & IRQ_NOPROBE)) {
-			desc->status |= IRQ_AUTODETECT | IRQ_WAITING;
+			desc->istate |= IRQS_AUTODETECT;
+			desc->status |= IRQ_WAITING;
 			if (irq_startup(desc))
 				desc->status |= IRQ_PENDING;
 		}
@@ -93,12 +93,11 @@ unsigned long probe_irq_on(void)
 	 */
 	for_each_irq_desc(i, desc) {
 		raw_spin_lock_irq(&desc->lock);
-		status = desc->status;
 
-		if (status & IRQ_AUTODETECT) {
+		if (desc->istate & IRQS_AUTODETECT) {
 			/* It triggered already - consider it spurious. */
-			if (!(status & IRQ_WAITING)) {
-				desc->status = status & ~IRQ_AUTODETECT;
+			if (!(desc->status & IRQ_WAITING)) {
+				desc->istate &= ~IRQS_AUTODETECT;
 				irq_shutdown(desc);
 			} else
 				if (i < 32)
@@ -125,19 +124,17 @@ EXPORT_SYMBOL(probe_irq_on);
  */
 unsigned int probe_irq_mask(unsigned long val)
 {
-	unsigned int status, mask = 0;
+	unsigned int mask = 0;
 	struct irq_desc *desc;
 	int i;
 
 	for_each_irq_desc(i, desc) {
 		raw_spin_lock_irq(&desc->lock);
-		status = desc->status;
-
-		if (status & IRQ_AUTODETECT) {
-			if (i < 16 && !(status & IRQ_WAITING))
+		if (desc->istate & IRQS_AUTODETECT) {
+			if (i < 16 && !(desc->status & IRQ_WAITING))
 				mask |= 1 << i;
 
-			desc->status = status & ~IRQ_AUTODETECT;
+			desc->istate &= ~IRQS_AUTODETECT;
 			irq_shutdown(desc);
 		}
 		raw_spin_unlock_irq(&desc->lock);
@@ -169,19 +166,17 @@ int probe_irq_off(unsigned long val)
 {
 	int i, irq_found = 0, nr_of_irqs = 0;
 	struct irq_desc *desc;
-	unsigned int status;
 
 	for_each_irq_desc(i, desc) {
 		raw_spin_lock_irq(&desc->lock);
-		status = desc->status;
 
-		if (status & IRQ_AUTODETECT) {
-			if (!(status & IRQ_WAITING)) {
+		if (desc->istate & IRQS_AUTODETECT) {
+			if (!(desc->status & IRQ_WAITING)) {
 				if (!nr_of_irqs)
 					irq_found = i;
 				nr_of_irqs++;
 			}
-			desc->status = status & ~IRQ_AUTODETECT;
+			desc->istate &= ~IRQS_AUTODETECT;
 			irq_shutdown(desc);
 		}
 		raw_spin_unlock_irq(&desc->lock);
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index 8f200310a9523a99100873d1b6ea374c832926a3..7ffd4f439b924dc2f0a038ea1cc16f38282ea3e1 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -33,6 +33,15 @@ enum {
 	IRQTF_AFFINITY,
 };
 
+/*
+ * Bit masks for desc->state
+ *
+ * IRQS_AUTODETECT		- autodetection in progress
+ */
+enum {
+	IRQS_AUTODETECT		= 0x00000001,
+};
+
 #define irq_data_to_desc(data)	container_of(data, struct irq_desc, irq_data)
 
 /* Set default functions for irq_chip structures: */
@@ -98,6 +107,7 @@ static inline void chip_bus_sync_unlock(struct irq_desc *desc)
 #include <linux/kallsyms.h>
 
 #define P(f) if (desc->status & f) printk("%14s set\n", #f)
+#define PS(f) if (desc->istate & f) printk("%14s set\n", #f)
 
 static inline void print_irq_desc(unsigned int irq, struct irq_desc *desc)
 {
@@ -117,7 +127,6 @@ static inline void print_irq_desc(unsigned int irq, struct irq_desc *desc)
 	P(IRQ_DISABLED);
 	P(IRQ_PENDING);
 	P(IRQ_REPLAY);
-	P(IRQ_AUTODETECT);
 	P(IRQ_WAITING);
 	P(IRQ_LEVEL);
 	P(IRQ_MASKED);
@@ -127,7 +136,9 @@ static inline void print_irq_desc(unsigned int irq, struct irq_desc *desc)
 	P(IRQ_NOPROBE);
 	P(IRQ_NOREQUEST);
 	P(IRQ_NOAUTOEN);
+
+	PS(IRQS_AUTODETECT);
 }
 
 #undef P
-
+#undef PS
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index dd4e5c21b9e7c3513783cc8b797160510eb59cf4..abe852c9449d443afe1463e96ad1f3df55e9b846 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -897,8 +897,9 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
 			desc->status |= IRQ_PER_CPU;
 #endif
 
-		desc->status &= ~(IRQ_AUTODETECT | IRQ_WAITING | IRQ_ONESHOT |
+		desc->status &= ~(IRQ_WAITING | IRQ_ONESHOT |
 				  IRQ_INPROGRESS | IRQ_SPURIOUS_DISABLED);
+		desc->istate &= ~IRQS_AUTODETECT;
 
 		if (new->flags & IRQF_ONESHOT)
 			desc->status |= IRQ_ONESHOT;