diff options
| author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2014-04-17 10:08:05 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-04-22 10:21:32 -0700 |
| commit | 725ce0d4738172c1cccea233111bf078785d660a (patch) | |
| tree | 9f020716eae6d32e6a186fd36983f4542941b532 /drivers/staging/comedi/drivers/pcmmio.c | |
| parent | c55881686302a5e7f19b82f0a163beec2cc314c3 (diff) | |
staging: comedi: pcmmio: 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: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/comedi/drivers/pcmmio.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/pcmmio.c | 22 |
1 files changed, 8 insertions, 14 deletions
diff --git a/drivers/staging/comedi/drivers/pcmmio.c b/drivers/staging/comedi/drivers/pcmmio.c index e89bca845349..bb29ecfcfef4 100644 --- a/drivers/staging/comedi/drivers/pcmmio.c +++ b/drivers/staging/comedi/drivers/pcmmio.c @@ -464,18 +464,16 @@ static int pcmmio_cancel(struct comedi_device *dev, struct comedi_subdevice *s) return 0; } -/* - * Internal trigger function to start acquisition for an 'INTERRUPT' subdevice. - */ -static int -pcmmio_inttrig_start_intr(struct comedi_device *dev, struct comedi_subdevice *s, - unsigned int trignum) +static int pcmmio_inttrig_start_intr(struct comedi_device *dev, + struct comedi_subdevice *s, + unsigned int trig_num) { struct pcmmio_private *devpriv = dev->private; + struct comedi_cmd *cmd = &s->async->cmd; unsigned long flags; int event = 0; - if (trignum != 0) + if (trig_num != cmd->start_arg) return -EINVAL; spin_lock_irqsave(&devpriv->spinlock, flags); @@ -517,15 +515,11 @@ static int pcmmio_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 = pcmmio_inttrig_start_intr; - break; - default: - /* TRIG_NOW */ + else /* TRIG_NOW */ event = pcmmio_start_intr(dev, s); - break; - } + spin_unlock_irqrestore(&devpriv->spinlock, flags); if (event) |