Jun 07 2012

drivers/staging/comedi/drivers/me4000.c: adjust suspicious bit operation 

Author: Julia Lawall <Julia.Lawall@lip6.fr>

TRIG_ROUND_NEAREST is 0, so a bit-and with it is always false.  The
value TRIG_ROUND_MASK covers the bits of the TRIG_ROUND constants, so
first pick those bits and then make the test using ==.

The same is done for TRIG_ROUND_UP for symmetry, even though bit-and would
be sufficient in this case.

This problem was found using Coccinelle (http://coccinelle.lip6.fr/).

Signed-off-by: Julia Lawall 
Signed-off-by: Greg Kroah-Hartman 

---
 drivers/staging/comedi/drivers/me4000.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)
 
diff --git a/drivers/staging/comedi/drivers/me4000.c b/drivers/staging/comedi/drivers/me4000.c
index cb6bf8c..09890b8 100644
--- a/drivers/staging/comedi/drivers/me4000.c
+++ b/drivers/staging/comedi/drivers/me4000.c
@@ -948,10 +948,10 @@ static int ai_round_cmd_args(struct comedi_device *dev,
 		*init_ticks = (cmd->start_arg * 33) / 1000;
 		rest = (cmd->start_arg * 33) % 1000;
 
-		if (cmd->flags & TRIG_ROUND_NEAREST) {
+		if ((cmd->flags & TRIG_ROUND_MASK) == TRIG_ROUND_NEAREST) {
 			if (rest > 33)
 				(*init_ticks)++;
-		} else if (cmd->flags & TRIG_ROUND_UP) {
+		} else if ((cmd->flags & TRIG_ROUND_MASK) == TRIG_ROUND_UP) {
 			if (rest)
 				(*init_ticks)++;
 		}
@@ -961,10 +961,10 @@ static int ai_round_cmd_args(struct comedi_device *dev,
 		*scan_ticks = (cmd->scan_begin_arg * 33) / 1000;
 		rest = (cmd->scan_begin_arg * 33) % 1000;
 
-		if (cmd->flags & TRIG_ROUND_NEAREST) {
+		if ((cmd->flags & TRIG_ROUND_MASK) == TRIG_ROUND_NEAREST) {
 			if (rest > 33)
 				(*scan_ticks)++;
-		} else if (cmd->flags & TRIG_ROUND_UP) {
+		} else if ((cmd->flags & TRIG_ROUND_MASK) == TRIG_ROUND_UP) {
 			if (rest)
 				(*scan_ticks)++;
 		}
@@ -974,10 +974,10 @@ static int ai_round_cmd_args(struct comedi_device *dev,
 		*chan_ticks = (cmd->convert_arg * 33) / 1000;
 		rest = (cmd->convert_arg * 33) % 1000;
 
-		if (cmd->flags & TRIG_ROUND_NEAREST) {
+		if ((cmd->flags & TRIG_ROUND_MASK) == TRIG_ROUND_NEAREST) {
 			if (rest > 33)
 				(*chan_ticks)++;
-		} else if (cmd->flags & TRIG_ROUND_UP) {
+		} else if ((cmd->flags & TRIG_ROUND_MASK) == TRIG_ROUND_UP) {
 			if (rest)
 				(*chan_ticks)++;
 		}

qlambert