staging: comedi: pcl812: use cfc_handle_events()

Use the comedi_fc helper function to automatically call the subdevice
(*cancel) function when needed and call comedi_event().

Update the Kconfig so that COMEDI_PCL812 selects COMEDI_FC.
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/Kconfig

@@ -177,6 +177,7 @@ config COMEDI_PCL730
 config COMEDI_PCL812
 	tristate "Advantech PCL-812/813 and ADlink ACL-8112/8113/8113/8216"
 	depends on VIRT_TO_BUS && ISA_DMA_API
+	select COMEDI_FC
 	---help---
 	  Enable support for Advantech PCL-812/PG, PCL-813/B, ADLink
 	  ACL-8112DG/HG/PG, ACL-8113, ACL-8216, ICP DAS A-821PGH/PGL/PGL-NDA,

drivers/staging/comedi/drivers/pcl812.c

@@ -863,7 +863,6 @@ static bool pcl812_ai_next_chan(struct comedi_device *dev,
 	if (cmd->stop_src == TRIG_COUNT &&
 	    devpriv->ai_act_scan >= cmd->stop_arg) {
 		/* all data sampled */
-		s->cancel(dev, s);
 		s->async->events |= COMEDI_CB_EOA;
 		return false;
 	}
@@ -879,7 +878,6 @@ static void pcl812_handle_eoc(struct comedi_device *dev,
 
 	if (pcl812_ai_eoc(dev, s, NULL, 0)) {
 		dev_dbg(dev->class_dev, "A/D cmd IRQ without DRDY!\n");
-		s->cancel(dev, s);
 		s->async->events |= COMEDI_CB_EOA | COMEDI_CB_ERROR;
 		return;
 	}
@@ -948,7 +946,7 @@ static irqreturn_t pcl812_interrupt(int irq, void *d)
 
 	pcl812_ai_clear_eoc(dev);
 
-	comedi_event(dev, s);
+	cfc_handle_events(dev, s);
 	return IRQ_HANDLED;
 }