staging: comedi: comedidev.h: clarify async->event error/cancel detection

Introduce COMEDI_CB_ERROR_MASK and COMEDI_CB_CANCEL_MASK to clarify the
async->events that indicate errors and cancel an async command.

Use the new defines to tidy up and clarify the code.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/comedi_fops.c

@@ -1555,9 +1555,7 @@ static int do_cmd_ioctl(struct comedi_device *dev,
 
 	comedi_buf_reset(s);
 
-	async->cb_mask =
-	    COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR |
-	    COMEDI_CB_OVERFLOW;
+	async->cb_mask = COMEDI_CB_BLOCK | COMEDI_CB_CANCEL_MASK;
 	if (async->cmd.flags & CMDF_WAKE_EOS)
 		async->cb_mask |= COMEDI_CB_EOS;
 
@@ -2390,14 +2388,14 @@ void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
 	if (!comedi_is_subdevice_running(s))
 		return;
 
-	if (s->
-	    async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR |
-			     COMEDI_CB_OVERFLOW)) {
+	if (s->async->events & COMEDI_CB_CANCEL_MASK)
 		runflags_mask |= SRF_RUNNING;
-	}
-	/* remember if an error event has occurred, so an error
-	 * can be returned the next time the user does a read() */
-	if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) {
+
+	/*
+	 * Remember if an error event has occurred, so an error
+	 * can be returned the next time the user does a read().
+	 */
+	if (s->async->events & COMEDI_CB_ERROR_MASK) {
 		runflags_mask |= SRF_ERROR;
 		runflags |= SRF_ERROR;
 	}

drivers/staging/comedi/comedidev.h

@@ -221,6 +221,9 @@ struct comedi_async {
  * @COMEDI_CB_EOBUF:		DEPRECATED: end of buffer
  * @COMEDI_CB_ERROR:		card error during acquisition
  * @COMEDI_CB_OVERFLOW:		buffer overflow/underflow
+ *
+ * @COMEDI_CB_ERROR_MASK:	events that indicate an error has occurred
+ * @COMEDI_CB_CANCEL_MASK:	events that will cancel an async command
  */
 #define COMEDI_CB_EOS		(1 << 0)
 #define COMEDI_CB_EOA		(1 << 1)
@@ -229,6 +232,9 @@ struct comedi_async {
 #define COMEDI_CB_ERROR		(1 << 4)
 #define COMEDI_CB_OVERFLOW	(1 << 5)
 
+#define COMEDI_CB_ERROR_MASK	(COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)
+#define COMEDI_CB_CANCEL_MASK	(COMEDI_CB_EOA | COMEDI_CB_ERROR_MASK)
+
 struct comedi_driver {
 	struct comedi_driver *next;
 

drivers/staging/comedi/drivers.c

@@ -375,7 +375,7 @@ unsigned int comedi_handle_events(struct comedi_device *dev,
 	if (events == 0)
 		return events;
 
-	if (events & (COMEDI_CB_EOA | COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW))
+	if (events & COMEDI_CB_CANCEL_MASK)
 		s->cancel(dev, s);
 
 	comedi_event(dev, s);

drivers/staging/comedi/drivers/amplc_pci230.c

@@ -1119,7 +1119,6 @@ static bool pci230_handle_ao_fifo(struct comedi_device *dev,
 	unsigned short dacstat;
 	unsigned int i, n;
 	unsigned int events = 0;
-	bool running;
 
 	/* Get DAC FIFO status. */
 	dacstat = inw(devpriv->daqio + PCI230_DACCON);
@@ -1201,12 +1200,8 @@ static bool pci230_handle_ao_fifo(struct comedi_device *dev,
 			events |= COMEDI_CB_OVERFLOW | COMEDI_CB_ERROR;
 		}
 	}
-	if (events & (COMEDI_CB_EOA | COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW))
-		running = false;
-	else
-		running = true;
 	async->events |= events;
-	return running;
+	return !(async->events & COMEDI_CB_CANCEL_MASK);
 }
 
 static int pci230_ao_inttrig_scan_begin(struct comedi_device *dev,
@@ -2128,8 +2123,7 @@ static void pci230_handle_ai(struct comedi_device *dev,
 		events |= COMEDI_CB_BLOCK;
 	}
 	async->events |= events;
-	if (!(async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR |
-			       COMEDI_CB_OVERFLOW))) {
+	if (!(async->events & COMEDI_CB_CANCEL_MASK)) {
 		/* update FIFO interrupt trigger level */
 		pci230_ai_update_fifo_trigger_level(dev, s);
 	}