staging: comedi: pcmmio: tidy up ao_rinsn()

Rename this function so it has namespace associated with the driver.

Move the 'chan' local variable out of the for () loop. The 'chan' is
constant for the comedi_insn and only needs to be fetched once from
the insn->chanspec.

Also, remove the sanity check of the chan. The comedi core will ensure
that the chan is valid for the subdevice before calling this function.

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>

diff --git a/drivers/staging/comedi/drivers/pcmmio.c b/drivers/staging/comedi/drivers/pcmmio.c
index d51fa69..9338f0c 100644 (file)
--- a/drivers/staging/comedi/drivers/pcmmio.c
+++ b/drivers/staging/comedi/drivers/pcmmio.c
@@ -879,18 +879,19 @@ static int pcmmio_ai_insn_read(struct comedi_device *dev,
        return insn->n;
 }
 
-static int ao_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
-                   struct comedi_insn *insn, unsigned int *data)
+static int pcmmio_ao_insn_read(struct comedi_device *dev,
+                              struct comedi_subdevice *s,
+                              struct comedi_insn *insn,
+                              unsigned int *data)
 {
        struct pcmmio_private *devpriv = dev->private;
-       int n;
+       unsigned int chan = CR_CHAN(insn->chanspec);
+       int i;
 
-       for (n = 0; n < insn->n; n++) {
-               unsigned chan = CR_CHAN(insn->chanspec);
-               if (chan < s->n_chan)
-                       data[n] = devpriv->ao_readback[chan];
-       }
-       return n;
+       for (i = 0; i < insn->n; i++)
+               data[i] = devpriv->ao_readback[chan];
+
+       return insn->n;
 }
 
 static int pcmmio_ao_wait_for_eoc(unsigned long iobase, unsigned int timeout)
@@ -1023,7 +1024,7 @@ static int pcmmio_attach(struct comedi_device *dev, struct comedi_devconfig *it)
        s->type = COMEDI_SUBD_AO;
        s->n_chan = 8;
        s->len_chanlist = s->n_chan;
-       s->insn_read = ao_rinsn;
+       s->insn_read = pcmmio_ao_insn_read;
        s->insn_write = pcmmio_ao_insn_write;
 
        /* initialize the resource enable register by clearing it */