staging: comedi: amplc_pci224: use comedi_fc helpers to validate timer args

Use the comedi_fc helper cfc_check_trigger_arg_is() to validate the
scan_begin_arg when the scan_begin_src is TRIG_TIMER.

For aesthetics reasons, rename the local variable 'tmp' to 'arg'.
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/drivers/amplc_pci224.c

@@ -719,7 +719,7 @@ pci224_ao_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s,
 {
 	struct pci224_private *devpriv = dev->private;
 	int err = 0;
-	unsigned int tmp;
+	unsigned int arg;
 
 	/* Step 1 : check if triggers are trivially valid */
 
@@ -746,14 +746,14 @@ pci224_ao_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s,
 	 * There's only one external trigger signal (which makes these
 	 * tests easier).  Only one thing can use it.
 	 */
-	tmp = 0;
+	arg = 0;
 	if (cmd->start_src & TRIG_EXT)
-		tmp++;
+		arg++;
 	if (cmd->scan_begin_src & TRIG_EXT)
-		tmp++;
+		arg++;
 	if (cmd->stop_src & TRIG_EXT)
-		tmp++;
-	if (tmp > 1)
+		arg++;
+	if (arg > 1)
 		err |= -EINVAL;
 
 	if (err)
@@ -786,10 +786,10 @@ pci224_ao_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s,
 		err |= cfc_check_trigger_arg_max(&cmd->scan_begin_arg,
 						 MAX_SCAN_PERIOD);
 
-		tmp = cmd->chanlist_len * CONVERT_PERIOD;
-		if (tmp < MIN_SCAN_PERIOD)
-			tmp = MIN_SCAN_PERIOD;
-		err |= cfc_check_trigger_arg_min(&cmd->scan_begin_arg, tmp);
+		arg = cmd->chanlist_len * CONVERT_PERIOD;
+		if (arg < MIN_SCAN_PERIOD)
+			arg = MIN_SCAN_PERIOD;
+		err |= cfc_check_trigger_arg_min(&cmd->scan_begin_arg, arg);
 		break;
 	case TRIG_EXT:
 		/* Force to external trigger 0. */
@@ -840,15 +840,13 @@ pci224_ao_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s,
 	/* Step 4: fix up any arguments. */
 
 	if (cmd->scan_begin_src == TRIG_TIMER) {
-		tmp = cmd->scan_begin_arg;
+		arg = cmd->scan_begin_arg;
 		/* Use two timers. */
 		i8253_cascade_ns_to_timer(I8254_OSC_BASE_10MHZ,
 					  &devpriv->cached_div1,
 					  &devpriv->cached_div2,
-					  &cmd->scan_begin_arg,
-					  cmd->flags);
-		if (tmp != cmd->scan_begin_arg)
-			err++;
+					  &arg, cmd->flags);
+		err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
 	}
 
 	if (err)