Device: remove _irq_attached flag, test with _irq == 0 instead

src/drivers/device/device_nuttx.cpp

@@ -91,8 +91,7 @@ Device::Device(const char *name,
 	_name(name),
 	_debug_enabled(false),
 	// private
-	_irq(irq),
-	_irq_attached(false)
+	_irq(irq)
 {
 	sem_init(&_lock, 0, 1);
 
@@ -109,7 +108,7 @@ Device::~Device()
 {
 	sem_destroy(&_lock);
 
-	if (_irq_attached) {
+	if (_irq) {
 		unregister_interrupt(_irq);
 	}
 }
@@ -128,20 +127,17 @@ Device::init()
 		ret = register_interrupt(_irq, this);
 
 		if (ret != OK) {
-			goto out;
+			_irq = 0;
 		}
-
-		_irq_attached = true;
 	}
 
-out:
 	return ret;
 }
 
 void
 Device::interrupt_enable()
 {
-	if (_irq_attached) {
+	if (_irq) {
 		up_enable_irq(_irq);
 	}
 }
@@ -149,7 +145,7 @@ Device::interrupt_enable()
 void
 Device::interrupt_disable()
 {
-	if (_irq_attached) {
+	if (_irq) {
 		up_disable_irq(_irq);
 	}
 }

src/drivers/device/device_nuttx.h

@@ -209,8 +209,7 @@ protected:
 	sem_t		_lock; /**< lock to protect access to all class members (also for derived classes) */
 
 private:
-	int		_irq;
-	bool		_irq_attached;
+	int		_irq; /**< if non-zero, it's a valid IRQ */
 
 	/** disable copy construction for this and all subclasses */
 	Device(const Device &);