staging: comedi: ni_mio_common: use CR_CHAN more consistently

Generally, the CR_CHAN macro is/should be used to access the relevant bits
for channel identification in cmd->*_arg when the corresponding
cmd->*_src==TRIG_EXT, including cmd->convert_arg in this case.

This patch does not fix a bug per se, as NISTC_AI_MODE1_CONVERT_SRC() already
masks the value sufficiently, but using CR_CHAN() here makes the code clearer as
it avoids passing some irrelevant bits to NISTC_AI_MODE1_CONVERT_SRC() in the
first place.

Signed-off-by: Spencer E. Olson <olsonse@umich.edu>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/comedi/drivers/ni_mio_common.c b/drivers/staging/comedi/drivers/ni_mio_common.c
index 5e8130a..1978d65 100644 (file)
--- a/drivers/staging/comedi/drivers/ni_mio_common.c
+++ b/drivers/staging/comedi/drivers/ni_mio_common.c
@@ -2428,7 +2428,8 @@ static int ni_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
                ni_stc_writew(dev, mode2, NISTC_AI_MODE2_REG);
                break;
        case TRIG_EXT:
-               mode1 |= NISTC_AI_MODE1_CONVERT_SRC(1 + cmd->convert_arg);
+               mode1 |= NISTC_AI_MODE1_CONVERT_SRC(1 +
+                                                   CR_CHAN(cmd->convert_arg));
                if ((cmd->convert_arg & CR_INVERT) == 0)
                        mode1 |= NISTC_AI_MODE1_CONVERT_POLARITY;
                ni_stc_writew(dev, mode1, NISTC_AI_MODE1_REG);