This driver currently allows a cmd->stop_src == TRIG_COUNT with a cmd->stop_arg
of 0 for both the analog input and output async commands. The (*do_cmd) for
both subdevices sets up and starts the command without handling the "empty
acquisition". This results in the interrupt functions trying to transfer 0 data
samples.
Validate that the cmd->stop_arg is >= 1 in the (*do_cmdtest) to prevent the
"empty acquisition".
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/cb_pcidas.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/comedi/drivers/cb_pcidas.c
b/drivers/staging/comedi/drivers/cb_pcidas.c
index f5dd7dd..db00493 100644
--- a/drivers/staging/comedi/drivers/cb_pcidas.c
+++ b/drivers/staging/comedi/drivers/cb_pcidas.c
@@ -886,7 +886,9 @@ static int cb_pcidas_ai_cmdtest(struct comedi_device *dev,
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)
@@ -1079,7 +1081,9 @@ static int cb_pcidas_ao_cmdtest(struct comedi_device *dev,
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
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