Commit 1ea37fd2 authored by H Hartley Sweeten's avatar H Hartley Sweeten Committed by Greg Kroah-Hartman
Browse files

staging: comedi: pcmmio: 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: default avatarH Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: default avatarIan Abbott <abbotti@mev.co.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent fe094b7e
......@@ -415,13 +415,6 @@ static int pcmmio_start_intr(struct comedi_device *dev,
unsigned int pol_bits = 0;
int i;
if (cmd->stop_src == TRIG_COUNT && devpriv->stop_count == 0) {
/* An empty acquisition! */
s->async->events |= COMEDI_CB_EOA;
devpriv->active = 0;
return 1;
}
devpriv->enabled_mask = 0;
devpriv->active = 1;
if (cmd->chanlist) {
......@@ -549,16 +542,10 @@ static int pcmmio_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;
......
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment