This driver currently allows a cmd->stop_src == TRIG_COUNT with a cmd->stop_arg
of 0. The (*do_cmd) then sets up and starts the command without handling the
"empty
acquisition". This results in the interrupt function 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/das16m1.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/drivers/staging/comedi/drivers/das16m1.c
b/drivers/staging/comedi/drivers/das16m1.c
index 1bf5be8..24b63c4 100644
--- a/drivers/staging/comedi/drivers/das16m1.c
+++ b/drivers/staging/comedi/drivers/das16m1.c
@@ -218,12 +218,10 @@ static int das16m1_cmd_test(struct comedi_device *dev,
err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
- if (cmd->stop_src == TRIG_COUNT) {
- /* any count is allowed */
- } else {
- /* 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)
return 3;
--
2.0.3
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