Indeed. It can be completely removed. I was intending to speed up DIO
reads during async acquisition but I decided against it because it would
create unpredictable latencies.
Thanks Ian for flagging it!
/Bernd
Ian Abbott wrote:
On 28/01/15 22:39, Rickard Strandqvist wrote:
Variable ar assigned a value that is never used.
I have also removed all the code that thereby serves no purpose.
This was found using a static code analysis program called cppcheck
Signed-off-by: Rickard Strandqvist
<rickard_strandqvist@xxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/drivers/usbduxsigma.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/staging/comedi/drivers/usbduxsigma.c
b/drivers/staging/comedi/drivers/usbduxsigma.c
index dc19435..7b80887 100644
--- a/drivers/staging/comedi/drivers/usbduxsigma.c
+++ b/drivers/staging/comedi/drivers/usbduxsigma.c
@@ -215,7 +215,6 @@ static void usbduxsigma_ai_handle_urb(struct
comedi_device *dev,
struct usbduxsigma_private *devpriv = dev->private;
struct comedi_async *async = s->async;
struct comedi_cmd *cmd = &async->cmd;
- unsigned int dio_state;
uint32_t val;
int ret;
int i;
@@ -225,7 +224,7 @@ static void usbduxsigma_ai_handle_urb(struct
comedi_device *dev,
devpriv->ai_counter = devpriv->ai_timer;
/* get the state of the dio pins to allow external trigger */
- dio_state = be32_to_cpu(devpriv->in_buf[0]);
+ be32_to_cpu(devpriv->in_buf[0]);
That line produces a compiler warning. The line can be removed as the
call to be32_to_cpu() has no side-effects. The "/* get the state ..."
comment line can also be removed as it is only associated with this line.
Perhaps Bernd intended to use dio_state for something here, but I'm not
sure what.
/* get the data from the USB bus and hand it over to comedi */
for (i = 0; i < cmd->chanlist_len; i++) {
--
http://www.berndporr.me.uk
http://www.linux-usb-daq.co.uk
http://www.imdb.com/name/nm3293421/
+44 (0)7840 340069
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