staging: comedi: make 'dev->attached' a bool bit-field

Change the `attached` member of `struct comedi_device` to a 1-bit
bit-field of type `bool`.  Change assigned values to `true` and `false`
and replace or remove comparison operations with simple boolean tests.

We'll put some extra bit-fields in the gap later to save space.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/comedidev.h

@@ -207,7 +207,7 @@ struct comedi_device {
 
 	const char *board_name;
 	const void *board_ptr;
-	int attached;
+	bool attached:1;
 	spinlock_t spinlock;
 	struct mutex mutex;
 	int in_request_module;

drivers/staging/comedi/drivers.c

@@ -120,7 +120,7 @@ static void cleanup_device(struct comedi_device *dev)
 
 static void __comedi_device_detach(struct comedi_device *dev)
 {
-	dev->attached = 0;
+	dev->attached = false;
 	if (dev->driver)
 		dev->driver->detach(dev);
 	else
@@ -290,7 +290,7 @@ static int comedi_device_postconfig(struct comedi_device *dev)
 		dev->board_name = "BUG";
 	}
 	smp_wmb();
-	dev->attached = 1;
+	dev->attached = true;
 	return 0;
 }
 

drivers/staging/comedi/drivers/cb_pcidas.c

@@ -1341,7 +1341,7 @@ static irqreturn_t cb_pcidas_interrupt(int irq, void *d)
 	static const int timeout = 10000;
 	unsigned long flags;
 
-	if (dev->attached == 0)
+	if (!dev->attached)
 		return IRQ_NONE;
 
 	async = s->async;

drivers/staging/comedi/drivers/cb_pcidas64.c

@@ -3113,7 +3113,7 @@ static irqreturn_t handle_interrupt(int irq, void *d)
 	/* an interrupt before all the postconfig stuff gets done could
 	 * cause a NULL dereference if we continue through the
 	 * interrupt handler */
-	if (dev->attached == 0) {
+	if (!dev->attached) {
 		DEBUG_PRINT("premature interrupt, ignoring\n");
 		return IRQ_HANDLED;
 	}

drivers/staging/comedi/drivers/das16.c

@@ -876,7 +876,7 @@ static void das16_interrupt(struct comedi_device *dev)
 	int num_bytes, residue;
 	int buffer_index;
 
-	if (dev->attached == 0) {
+	if (!dev->attached) {
 		comedi_error(dev, "premature interrupt");
 		return;
 	}

drivers/staging/comedi/drivers/das16m1.c

@@ -499,7 +499,7 @@ static irqreturn_t das16m1_interrupt(int irq, void *d)
 	int status;
 	struct comedi_device *dev = d;
 
-	if (dev->attached == 0) {
+	if (!dev->attached) {
 		comedi_error(dev, "premature interrupt");
 		return IRQ_HANDLED;
 	}

drivers/staging/comedi/drivers/das1800.c

@@ -731,7 +731,7 @@ static irqreturn_t das1800_interrupt(int irq, void *d)
 	struct comedi_device *dev = d;
 	unsigned int status;
 
-	if (dev->attached == 0) {
+	if (!dev->attached) {
 		comedi_error(dev, "premature interrupt");
 		return IRQ_HANDLED;
 	}

drivers/staging/comedi/drivers/ni_660x.c

@@ -887,7 +887,7 @@ static irqreturn_t ni_660x_interrupt(int irq, void *d)
 	unsigned i;
 	unsigned long flags;
 
-	if (dev->attached == 0)
+	if (!dev->attached)
 		return IRQ_NONE;
 	/* lock to avoid race with comedi_poll */
 	spin_lock_irqsave(&devpriv->interrupt_lock, flags);

drivers/staging/comedi/drivers/ni_at_a2150.c

@@ -204,7 +204,7 @@ static irqreturn_t a2150_interrupt(int irq, void *d)
 	short dpnt;
 	static const int sample_size = sizeof(devpriv->dma_buffer[0]);
 
-	if (dev->attached == 0) {
+	if (!dev->attached) {
 		comedi_error(dev, "premature interrupt");
 		return IRQ_HANDLED;
 	}

drivers/staging/comedi/drivers/ni_labpc.c

@@ -1367,7 +1367,7 @@ static irqreturn_t labpc_interrupt(int irq, void *d)
 	struct comedi_async *async;
 	struct comedi_cmd *cmd;
 
-	if (dev->attached == 0) {
+	if (!dev->attached) {
 		comedi_error(dev, "premature interrupt");
 		return IRQ_HANDLED;
 	}

drivers/staging/comedi/drivers/ni_mio_common.c

@@ -847,7 +847,7 @@ static irqreturn_t ni_E_interrupt(int irq, void *d)
 	struct mite_struct *mite = devpriv->mite;
 #endif
 
-	if (dev->attached == 0)
+	if (!dev->attached)
 		return IRQ_NONE;
 	smp_mb();		/*  make sure dev->attached is checked before handler does anything else. */
 

drivers/staging/comedi/drivers/ni_pcidio.c

@@ -420,7 +420,7 @@ static irqreturn_t nidio_interrupt(int irq, void *d)
 	unsigned int m_status = 0;
 
 	/* interrupcions parasites */
-	if (dev->attached == 0) {
+	if (!dev->attached) {
 		/* assume it's from another card */
 		return IRQ_NONE;
 	}

drivers/staging/comedi/drivers/s626.c

@@ -758,7 +758,7 @@ static irqreturn_t s626_irq_handler(int irq, void *d)
 	uint8_t group;
 	uint16_t irqbit;
 
-	if (dev->attached == 0)
+	if (!dev->attached)
 		return IRQ_NONE;
 	/*  lock to avoid race with comedi_poll */
 	spin_lock_irqsave(&dev->spinlock, flags);