diff options
| author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2014-09-09 16:15:52 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-11 14:35:21 -0700 |
| commit | fe094b7e00b507e279782e0a319b7fb32e53d2d0 (patch) | |
| tree | 679cea69c4f7af3d5b262c3d1ae51a72691decdf /drivers/staging/comedi/drivers/pcl711.c | |
| parent | 7be7f9c3e3f87fd1263014a14b177409b6542e54 (diff) | |
staging: comedi: pcl711: remove "empty acquisition" async command
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@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/pcl711.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/pcl711.c | 13 |
1 files changed, 4 insertions, 9 deletions
diff --git a/drivers/staging/comedi/drivers/pcl711.c b/drivers/staging/comedi/drivers/pcl711.c index 20ed09c6705f..47f4887108a7 100644 --- a/drivers/staging/comedi/drivers/pcl711.c +++ b/drivers/staging/comedi/drivers/pcl711.c @@ -334,7 +334,9 @@ static int pcl711_ai_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); - 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) @@ -376,15 +378,8 @@ static int pcl711_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s) pcl711_set_changain(dev, s, cmd->chanlist[0]); - if (cmd->stop_src == TRIG_COUNT) { - if (cmd->stop_arg == 0) { - /* an empty acquisition */ - s->async->events |= COMEDI_CB_EOA; - comedi_event(dev, s); - return 0; - } + if (cmd->stop_src == TRIG_COUNT) devpriv->ntrig = cmd->stop_arg; - } if (cmd->scan_begin_src == TRIG_TIMER) { pcl711_ai_load_counters(dev); |