staging: comedi: ni_tio: fix ni_tio_insn_config()

The (*insn_config) functions are supposed to return an errno or the number
of 'data' values used for the instruction (insn->n). Currently this function
returns an errno or 0. Fix the function to work like the core expects.

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/ni_tio.c b/drivers/staging/comedi/drivers/ni_tio.c
index 51dd368..10d4585 100644 (file)
--- a/drivers/staging/comedi/drivers/ni_tio.c
+++ b/drivers/staging/comedi/drivers/ni_tio.c
@@ -1295,15 +1295,18 @@ int ni_tio_insn_config(struct comedi_device *dev,
        struct ni_gpct *counter = s->private;
        unsigned int cidx = counter->counter_index;
        unsigned int status;
+       int ret = 0;
 
        switch (data[0]) {
        case INSN_CONFIG_SET_COUNTER_MODE:
-               return ni_tio_set_counter_mode(counter, data[1]);
+               ret = ni_tio_set_counter_mode(counter, data[1]);
+               break;
        case INSN_CONFIG_ARM:
-               return ni_tio_arm(counter, true, data[1]);
+               ret = ni_tio_arm(counter, true, data[1]);
+               break;
        case INSN_CONFIG_DISARM:
-               ni_tio_arm(counter, false, 0);
-               return 0;
+               ret = ni_tio_arm(counter, false, 0);
+               break;
        case INSN_CONFIG_GET_COUNTER_STATUS:
                data[1] = 0;
                status = ni_tio_read(counter, NITIO_SHARED_STATUS_REG(cidx));
@@ -1313,25 +1316,29 @@ int ni_tio_insn_config(struct comedi_device *dev,
                                data[1] |= COMEDI_COUNTER_COUNTING;
                }
                data[2] = COMEDI_COUNTER_ARMED | COMEDI_COUNTER_COUNTING;
-               return 0;
+               break;
        case INSN_CONFIG_SET_CLOCK_SRC:
-               return ni_tio_set_clock_src(counter, data[1], data[2]);
+               ret = ni_tio_set_clock_src(counter, data[1], data[2]);
+               break;
        case INSN_CONFIG_GET_CLOCK_SRC:
                ni_tio_get_clock_src(counter, &data[1], &data[2]);
-               return 0;
+               break;
        case INSN_CONFIG_SET_GATE_SRC:
-               return ni_tio_set_gate_src(counter, data[1], data[2]);
+               ret = ni_tio_set_gate_src(counter, data[1], data[2]);
+               break;
        case INSN_CONFIG_GET_GATE_SRC:
-               return ni_tio_get_gate_src(counter, data[1], &data[2]);
+               ret = ni_tio_get_gate_src(counter, data[1], &data[2]);
+               break;
        case INSN_CONFIG_SET_OTHER_SRC:
-               return ni_tio_set_other_src(counter, data[1], data[2]);
+               ret = ni_tio_set_other_src(counter, data[1], data[2]);
+               break;
        case INSN_CONFIG_RESET:
                ni_tio_reset_count_and_disarm(counter);
-               return 0;
-       default:
                break;
+       default:
+               return -EINVAL;
        }
-       return -EINVAL;
+       return ret ? ret : insn->n;
 }
 EXPORT_SYMBOL_GPL(ni_tio_insn_config);