staging: comedi: contec_pci_dio: cleanup contec_do_insn_bits

Create local variables for the mask and bits values passed in
the data pointer to make this function a bit clearer.

Return the state of the output bits (s->state) in data[1] since
this is what comedilib is expecting.

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/contec_pci_dio.c b/drivers/staging/comedi/drivers/contec_pci_dio.c
index b7b60d3b609386a1e5e3049f930c1a35bc157b39..12ad9fa32f5679befc1a187bb3b65ff706eff612 100644 (file)
--- a/drivers/staging/comedi/drivers/contec_pci_dio.c
+++ b/drivers/staging/comedi/drivers/contec_pci_dio.c
@@ -44,12 +44,18 @@ static int contec_do_insn_bits(struct comedi_device *dev,
                               struct comedi_subdevice *s,
                               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);
 
                outw(s->state, dev->iobase + PIO1616L_DO_REG);
        }
+
+       data[1] = s->state;
+
        return insn->n;
 }