This driver currently allows a cmd->stop_src == TRIG_COUNT with a cmd->stop_arg
of 0. This causes the (*do_cmd) to immediately 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@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/drivers/pcmuio.c | 19 +++----------------
1 file changed, 3 insertions(+), 16 deletions(-)
diff --git a/drivers/staging/comedi/drivers/pcmuio.c b/drivers/staging/comedi/drivers/pcmuio.c
index 1bca3fb..ce12580 100644
--- a/drivers/staging/comedi/drivers/pcmuio.c
+++ b/drivers/staging/comedi/drivers/pcmuio.c
@@ -416,13 +416,6 @@ static int pcmuio_start_intr(struct comedi_device *dev,
unsigned int pol_bits = 0;
int i;
- if (!chip->continuous && chip->stop_count == 0) {
- /* An empty acquisition! */
- s->async->events |= COMEDI_CB_EOA;
- chip->active = 0;
- return 1;
- }
-
chip->enabled_mask = 0;
chip->active = 1;
if (cmd->chanlist) {
@@ -564,16 +557,10 @@ static int pcmuio_cmdtest(struct comedi_device *dev,
err |= cfc_check_trigger_arg_is(&cmd->convert_arg, 0);
err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
- switch (cmd->stop_src) {
- case TRIG_COUNT:
- /* any count allowed */
- break;
- case 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);
- break;
- default:
- break;
- }
if (err)
return 3;
--
2.0.3
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