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Commit cb789b80 authored by H Hartley Sweeten's avatar H Hartley Sweeten Committed by Greg Kroah-Hartman
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staging: comedi: pcmuio: fix the cmd->start_arg use for TRIG_INT 



This driver supports a cmd->start_src of TRIG_NOW or TRIG_INT. The
cmd->start_arg is trivially validated for both sources to be 0.

For a TRIG_INT source, the cmd->start_arg is actually the valid
trig_num that is used by the async (*inttrig) callback.

Refactor the (*inttrig) function so that the cmd->start_arg is used
to check the trig_num instead of the open coded value.

For aesthetics, refactor the (*do_cmd) to use if/else instead if the
switch when handling the cmd->start_src.

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 725ce0d4

drivers/staging/comedi/drivers/pcmuio.c

+8 −14
Original line number Diff line number Diff line
@@ -460,20 +460,18 @@ static int pcmuio_cancel(struct comedi_device *dev, struct comedi_subdevice *s) 
	return 0;

}



/*

 * Internal trigger function to start acquisition for an 'INTERRUPT' subdevice.

 */

static int

pcmuio_inttrig_start_intr(struct comedi_device *dev, struct comedi_subdevice *s,

			  unsigned int trignum)

static int pcmuio_inttrig_start_intr(struct comedi_device *dev,

				     struct comedi_subdevice *s,

				     unsigned int trig_num)

{

	struct pcmuio_private *devpriv = dev->private;

	struct comedi_cmd *cmd = &s->async->cmd;

	int asic = pcmuio_subdevice_to_asic(s);

	struct pcmuio_asic *chip = &devpriv->asics[asic];

	unsigned long flags;

	int event = 0;



	if (trignum != 0)

	if (trig_num != cmd->start_arg)

		return -EINVAL;



	spin_lock_irqsave(&chip->spinlock, flags);
@@ -518,15 +516,11 @@ static int pcmuio_cmd(struct comedi_device *dev, struct comedi_subdevice *s) 
	}



	/* Set up start of acquisition. */

	switch (cmd->start_src) {

	case TRIG_INT:

	if (cmd->start_src == TRIG_INT)

		s->async->inttrig = pcmuio_inttrig_start_intr;

		break;

	default:

		/* TRIG_NOW */

	else	/* TRIG_NOW */

		event = pcmuio_start_intr(dev, s);

		break;

	}



	spin_unlock_irqrestore(&chip->spinlock, flags);



	if (event)