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staging: comedi: pcmuio: 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>
This commit is contained in:
H Hartley Sweeten 2014-09-09 16:15:56 -07:00 committed by Greg Kroah-Hartman
parent 22499048e3
commit 7173126484
1 changed files with 3 additions and 16 deletions
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19
drivers/staging/comedi/drivers/pcmuio.c
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@ -416,13 +416,6 @@ static int pcmuio_start_intr(struct comedi_device *dev,
unsigned int pol_bits = 0;
int i;
if (!chip->continuous && chip->stop_count == 0) {
/* An empty acquisition! */
s->async->events |= COMEDI_CB_EOA;
chip->active = 0;
return 1;
}
chip->enabled_mask = 0;
chip->active = 1;
if (cmd->chanlist) {
@ -564,16 +557,10 @@ static int pcmuio_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;