[PATCH 18/19] staging: comedi: ni_tiocmd: tidy up ni_tio_input_cmd()

[H Hartley Sweeten]

The cmd->start_src is validated in the (*do_cmdtest) before this
function is called. All valid trigger sources are handled so the
default BUG() case can never occure.

For aesthetics, refactor the switch into if/else tests and remove
the BUG().

For aesthetics, rename the local variable 'retval' to simply 'ret'.

Signed-off-by: H Hartley Sweeten <hsweeten at visionengravers.com>
Cc: Ian Abbott <abbotti at mev.co.uk>
Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 drivers/staging/comedi/drivers/ni_tiocmd.c | 30 ++++++++++--------------------
 1 file changed, 10 insertions(+), 20 deletions(-)

diff --git a/drivers/staging/comedi/drivers/ni_tiocmd.c b/drivers/staging/comedi/drivers/ni_tiocmd.c
index 334ce35..c360667 100644
--- a/drivers/staging/comedi/drivers/ni_tiocmd.c
+++ b/drivers/staging/comedi/drivers/ni_tiocmd.c
@@ -118,7 +118,7 @@ static int ni_tio_input_cmd(struct comedi_subdevice *s)
 	unsigned cidx = counter->counter_index;
 	struct comedi_async *async = s->async;
 	struct comedi_cmd *cmd = &async->cmd;
-	int retval = 0;
+	int ret = 0;
 
 	/* write alloc the entire buffer */
 	comedi_buf_write_alloc(s, async->prealloc_bufsz);
@@ -137,29 +137,19 @@ static int ni_tio_input_cmd(struct comedi_subdevice *s)
 	}
 	ni_tio_set_bits(counter, NITIO_CMD_REG(cidx), GI_SAVE_TRACE, 0);
 	ni_tio_configure_dma(counter, true, true);
-	switch (cmd->start_src) {
-	case TRIG_NOW:
-		async->inttrig = NULL;
-		mite_dma_arm(counter->mite_chan);
-		retval = ni_tio_arm(counter, 1, NI_GPCT_ARM_IMMEDIATE);
-		break;
-	case TRIG_INT:
+
+	if (cmd->start_src == TRIG_INT) {
 		async->inttrig = &ni_tio_input_inttrig;
-		break;
-	case TRIG_EXT:
+	} else {	/* TRIG_NOW || TRIG_EXT || TRIG_OTHER */
 		async->inttrig = NULL;
 		mite_dma_arm(counter->mite_chan);
-		retval = ni_tio_arm(counter, 1, cmd->start_arg);
-		break;
-	case TRIG_OTHER:
-		async->inttrig = NULL;
-		mite_dma_arm(counter->mite_chan);
-		break;
-	default:
-		BUG();
-		break;
+
+		if (cmd->start_src == TRIG_NOW)
+			ret = ni_tio_arm(counter, 1, NI_GPCT_ARM_IMMEDIATE);
+		else if (cmd->start_src == TRIG_EXT)
+			ret = ni_tio_arm(counter, 1, cmd->start_arg);
 	}
-	return retval;
+	return ret;
 }
 
 static int ni_tio_output_cmd(struct comedi_subdevice *s)
-- 
2.0.3