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staging: comedi: amplc_dio200_common: remove "empty acquisition" async command

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This driver currently allows a cmd->stop_src == TRIG_COUNT with a cmd->stop_arg
of 0. This causes the (*do_cmd) to immediatelt 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 16:15:35 -07:00 • committed by Greg Kroah-Hartman
parent 103e280141
commit 75d756e9f0
1 changed files with 14 additions and 28 deletions
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22
drivers/staging/comedi/drivers/amplc_dio200_common.c
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@ -217,14 +217,7 @@ static int dio200_start_intr(struct comedi_device *dev,
struct comedi_cmd *cmd = &s->async->cmd;
unsigned int n;
unsigned isn_bits;
int retval = 0;
if (cmd->stop_src == TRIG_COUNT && subpriv->stopcount == 0) {
/* An empty acquisition! */
s->async->events |= COMEDI_CB_EOA;
subpriv->active = false;
retval = 1;
} else {
/* Determine interrupt sources to enable. */
isn_bits = 0;
if (cmd->chanlist) {
@ -236,9 +229,8 @@ static int dio200_start_intr(struct comedi_device *dev,
subpriv->enabled_isns = isn_bits;
if (board->has_int_sce)
dio200_write8(dev, subpriv->ofs, isn_bits);
}
return retval;
return 0;
}
static int dio200_inttrig_start_intr(struct comedi_device *dev,
@ -425,16 +417,10 @@ static int dio200_subdev_intr_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;