staging: comedi: rti800: tidy up rti800_do_insn_bits()

To clarify the function a bit, add local variables for the 'mask'
and 'bits', passed by the comedi core, used to update the digital
outputs.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/comedi/drivers/rti800.c b/drivers/staging/comedi/drivers/rti800.c
index 72bda292645d7cd8e9e3939029e47a8128bbf397..4b2ddc04c1763fa6f34176722c094153767daca5 100644 (file)
--- a/drivers/staging/comedi/drivers/rti800.c
+++ b/drivers/staging/comedi/drivers/rti800.c
@@ -265,11 +265,16 @@ static int rti800_di_insn_bits(struct comedi_device *dev,
 
 static int rti800_do_insn_bits(struct comedi_device *dev,
                               struct comedi_subdevice *s,
-                              struct comedi_insn *insn, unsigned int *data)
+                              struct comedi_insn *insn,
+                              unsigned int *data)
 {
-       if (data[0]) {
-               s->state &= ~data[0];
-               s->state |= data[0] & data[1];
+       unsigned int mask = data[0];
+       unsigned int bits = data[1];
+
+       if (mask) {
+               s->state &= ~mask;
+               s->state |= (bits & mask);
+
                /* Outputs are inverted... */
                outb(s->state ^ 0xff, dev->iobase + RTI800_DO);
        }