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 <hswee...@visionengravers.com>
Cc: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/staging/comedi/drivers/amplc_pci224.c | 25 ++++++++++---------------
1 file changed, 10 insertions(+), 15 deletions(-)
diff --git a/drivers/staging/comedi/drivers/amplc_pci224.c
b/drivers/staging/comedi/drivers/amplc_pci224.c
index b65cd48..8a55482 100644
--- a/drivers/staging/comedi/drivers/amplc_pci224.c
+++ b/drivers/staging/comedi/drivers/amplc_pci224.c
@@ -494,21 +494,16 @@ static void pci224_ao_start(struct comedi_device *dev,
unsigned long flags;
set_bit(AO_CMD_STARTED, &devpriv->state);
- if (cmd->stop_src == TRIG_COUNT && devpriv->ao_stop_count == 0) {
- /* An empty acquisition! */
- s->async->events |= COMEDI_CB_EOA;
- cfc_handle_events(dev, s);
- } else {
- /* Enable interrupts. */
- spin_lock_irqsave(&devpriv->ao_spinlock, flags);
- if (cmd->stop_src == TRIG_EXT)
- devpriv->intsce = PCI224_INTR_EXT | PCI224_INTR_DAC;
- else
- devpriv->intsce = PCI224_INTR_DAC;
- outb(devpriv->intsce, devpriv->iobase1 + PCI224_INT_SCE);
- spin_unlock_irqrestore(&devpriv->ao_spinlock, flags);
- }
+ /* Enable interrupts. */
+ spin_lock_irqsave(&devpriv->ao_spinlock, flags);
+ if (cmd->stop_src == TRIG_EXT)
+ devpriv->intsce = PCI224_INTR_EXT | PCI224_INTR_DAC;
+ else
+ devpriv->intsce = PCI224_INTR_DAC;
+
+ outb(devpriv->intsce, devpriv->iobase1 + PCI224_INT_SCE);
+ spin_unlock_irqrestore(&devpriv->ao_spinlock, flags);
}
/*
@@ -782,7 +777,7 @@ pci224_ao_cmdtest(struct comedi_device *dev, struct
comedi_subdevice *s,
switch (cmd->stop_src) {
case TRIG_COUNT:
- /* Any count allowed. */
+ err |= cfc_check_trigger_arg_min(&cmd->stop_arg, 1);
break;
case TRIG_EXT:
/* Force to external trigger 0. */
--
2.0.3
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