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>

1 files changed, 2 insertions, 9 deletions

diff --git a/drivers/staging/comedi/drivers/pcmuio.c b/drivers/staging/comedi/drivers/pcmuio.c
index 0e71eacae14b..8771e4b5d4cb 100644
--- 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;