[PATCH 01/34] staging: comedi: addi_apci_2032: remove "empty acquisition" async command

[H Hartley Sweeten]

This driver currently allows a cmd->stop_src == TRIG_COUNT with a cmd->stop_arg
of 0. This causes the (*do_cmd) to immediatelt generate a COMEDI_CB_EOA event
without acquiring any data.

This "empty acquisition" async command is not really useful. Validate that the
cmd->stop_arg is >= 1 in the (*do_cmdtest) and remove the "empty acquisition"
code.

Signed-off-by: H Hartley Sweeten <hsweeten at visionengravers.com>
Cc: Ian Abbott <abbotti at mev.co.uk>
Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 drivers/staging/comedi/drivers/addi_apci_2032.c | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/drivers/staging/comedi/drivers/addi_apci_2032.c b/drivers/staging/comedi/drivers/addi_apci_2032.c
index 45ea4a4..8514811 100644
--- a/drivers/staging/comedi/drivers/addi_apci_2032.c
+++ b/drivers/staging/comedi/drivers/addi_apci_2032.c
@@ -96,16 +96,9 @@ static bool apci2032_int_start(struct comedi_device *dev,
 
 	subpriv->enabled_isns = enabled_isns;
 	subpriv->stop_count = cmd->stop_arg;
-	if (cmd->stop_src == TRIG_COUNT && subpriv->stop_count == 0) {
-		/* An empty acquisition! */
-		s->async->events |= COMEDI_CB_EOA;
-		subpriv->active = false;
-		do_event = true;
-	} else {
-		subpriv->active = true;
-		outl(enabled_isns, dev->iobase + APCI2032_INT_CTRL_REG);
-		do_event = false;
-	}
+	subpriv->active = true;
+	outl(enabled_isns, dev->iobase + APCI2032_INT_CTRL_REG);
+	do_event = false;
 
 	return do_event;
 }
@@ -141,7 +134,9 @@ static int apci2032_int_cmdtest(struct comedi_device *dev,
 	err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
 	err |= cfc_check_trigger_arg_is(&cmd->convert_arg, 0);
 	err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
-	if (cmd->stop_src == TRIG_NONE)
+	if (cmd->stop_src == TRIG_COUNT)
+		err |= cfc_check_trigger_arg_min(&cmd->stop_arg, 1);
+	else	/* TRIG_NONE */
 		err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
 
 	if (err)
-- 
2.0.3