From: H Hartley Sweeten <hsweeten@visionengravers.com>
Date: Tue, 9 Apr 2013 01:18:26 +0000 (-0700)
Subject: staging: comedi: rti800: tidy up rti800_do_insn_bits()
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=bd838bea6a694bfa5bef5f3d0a1ed0484b7142f0;p=linux-beck.git

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 72bda292645d..4b2ddc04c176 100644
--- 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);
 	}