forked from Minki/linux
staging: comedi: usbduxsigma: prevent "empty acquisition" async commands
This driver currently allows a cmd->stop_src == TRIG_COUNT with a cmd->stop_arg of 0 for both the analog input and output async commands. The (*do_cmd) for both subdevices sets up and starts the command without handling the "empty acquisition". This results in the interrupt functions trying to transfer 0 data samples. Validate that the cmd->stop_arg is >= 1 in the (*do_cmdtest) to prevent the "empty acquisition". 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>
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@ -558,12 +558,10 @@ static int usbduxsigma_ai_cmdtest(struct comedi_device *dev,
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err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
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if (cmd->stop_src == TRIG_COUNT) {
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/* any count is allowed */
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} else {
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/* TRIG_NONE */
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if (cmd->stop_src == TRIG_COUNT)
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err |= cfc_check_trigger_arg_min(&cmd->stop_arg, 1);
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else /* TRIG_NONE */
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err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
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}
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if (err)
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return 3;
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@ -935,12 +933,10 @@ static int usbduxsigma_ao_cmdtest(struct comedi_device *dev,
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err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
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if (cmd->stop_src == TRIG_COUNT) {
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/* any count is allowed */
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} else {
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/* TRIG_NONE */
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if (cmd->stop_src == TRIG_COUNT)
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err |= cfc_check_trigger_arg_min(&cmd->stop_arg, 1);
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else /* TRIG_NONE */
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err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
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}
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if (err)
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return 3;
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