diff options
| author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2014-09-09 16:15:46 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-11 14:35:20 -0700 |
| commit | 2c8af779c4c205ff379dcc3ac52831730ec0f5d5 (patch) | |
| tree | c9fabdcf533a56952b345b526ac52ef4f0fe65c3 /drivers/staging/comedi/drivers/das16.c | |
| parent | c5d9973b046fb8e0b0f3a8ad925d0033eec59856 (diff) | |
staging: comedi: das16: prevent "empty acquisition" async command
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 <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/comedi/drivers/das16.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/das16.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/staging/comedi/drivers/das16.c b/drivers/staging/comedi/drivers/das16.c index baec9f2bd43c..2d8e86cec47a 100644 --- a/drivers/staging/comedi/drivers/das16.c +++ b/drivers/staging/comedi/drivers/das16.c @@ -692,7 +692,9 @@ static int das16_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s, err |= cfc_check_trigger_arg_min(&cmd->convert_arg, board->ai_speed); - 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) |