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 <hswee...@visionengravers.com>
Cc: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/staging/comedi/drivers/pcmmio.c | 19 +++----------------
1 file changed, 3 insertions(+), 16 deletions(-)
diff --git a/drivers/staging/comedi/drivers/pcmmio.c
b/drivers/staging/comedi/drivers/pcmmio.c
index 2c9a842..67b66baf 100644
--- a/drivers/staging/comedi/drivers/pcmmio.c
+++ b/drivers/staging/comedi/drivers/pcmmio.c
@@ -415,13 +415,6 @@ static int pcmmio_start_intr(struct comedi_device *dev,
unsigned int pol_bits = 0;
int i;
- if (cmd->stop_src == TRIG_COUNT && devpriv->stop_count == 0) {
- /* An empty acquisition! */
- s->async->events |= COMEDI_CB_EOA;
- devpriv->active = 0;
- return 1;
- }
-
devpriv->enabled_mask = 0;
devpriv->active = 1;
if (cmd->chanlist) {
@@ -549,16 +542,10 @@ static int pcmmio_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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