staging: comedi: pcmuio: remove 'first_chan'

This member of the subdevice private data is always initialize to
'0' due to the 'byte_no' always being zero when it is set during
the attach. Simplify the driver a bit by removing it.

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/pcmuio.c b/drivers/staging/comedi/drivers/pcmuio.c
index 0e71eac..8771e4b 100644 (file)
--- a/drivers/staging/comedi/drivers/pcmuio.c
+++ b/drivers/staging/comedi/drivers/pcmuio.c
@@ -152,8 +152,6 @@ struct pcmuio_subdev_private {
        struct {
                /* if non-negative, this subdev has an interrupt asic */
                int asic;
-               /* if nonnegative, the first channel id for interrupts */
-               int first_chan;
                /*
                 * the number of asic channels in this
                 * subdev that have interrutps
@@ -377,7 +375,6 @@ static void pcmuio_handle_intr_subdev(struct comedi_device *dev,
 
        mytrig = triggered >> subpriv->intr.asic_chan;
        mytrig &= ((0x1 << subpriv->intr.num_asic_chans) - 1);
-       mytrig <<= subpriv->intr.first_chan;
 
        if (!(mytrig & subpriv->intr.enabled_mask))
                goto done;
@@ -520,8 +517,7 @@ static int pcmuio_start_intr(struct comedi_device *dev,
                                    << CR_CHAN(cmd->chanlist[n]);
                        }
                }
-               bits &= ((0x1 << subpriv->intr.num_asic_chans) -
-                        1) << subpriv->intr.first_chan;
+               bits &= ((0x1 << subpriv->intr.num_asic_chans) - 1);
                subpriv->intr.enabled_mask = bits;
 
                /* set pol and enab intrs for this subdev.. */
@@ -727,7 +723,6 @@ static int pcmuio_attach(struct comedi_device *dev, struct comedi_devconfig *it)
                s->insn_config = pcmuio_dio_insn_config;
                s->n_chan = min(chans_left, MAX_CHANS_PER_SUBDEV);
                subpriv->intr.asic = -1;
-               subpriv->intr.first_chan = -1;
                subpriv->intr.asic_chan = -1;
                subpriv->intr.num_asic_chans = -1;
                subpriv->intr.active = 0;
@@ -752,10 +747,8 @@ static int pcmuio_attach(struct comedi_device *dev, struct comedi_devconfig *it)
                                subpriv->intr.asic = asic;
                                subpriv->intr.active = 0;
                                subpriv->intr.stop_count = 0;
-                               subpriv->intr.first_chan = byte_no * 8;
                                subpriv->intr.asic_chan = thisasic_chanct;
-                               subpriv->intr.num_asic_chans =
-                                   s->n_chan - subpriv->intr.first_chan;
+                               subpriv->intr.num_asic_chans = s->n_chan;
                                dev->read_subdev = s;
                                s->subdev_flags |= SDF_CMD_READ;
                                s->cancel = pcmuio_cancel;