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_strandqv...@spectrumdigital.se>
---
 drivers/staging/comedi/drivers/rtd520.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/comedi/drivers/rtd520.c 
b/drivers/staging/comedi/drivers/rtd520.c
index 581aa58..305631c 100644
--- a/drivers/staging/comedi/drivers/rtd520.c
+++ b/drivers/staging/comedi/drivers/rtd520.c
@@ -1031,8 +1031,6 @@ static int rtd_ai_cmd(struct comedi_device *dev, struct 
comedi_subdevice *s)
 static int rtd_ai_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
 {
        struct rtd_private *devpriv = dev->private;
-       u32 overrun;
-       u16 status;
 
        /* pacer stop source: SOFTWARE */
        writel(0, dev->mmio + LAS0_PACER_STOP);
@@ -1040,8 +1038,8 @@ static int rtd_ai_cancel(struct comedi_device *dev, 
struct comedi_subdevice *s)
        writel(0, dev->mmio + LAS0_ADC_CONVERSION);
        writew(0, dev->mmio + LAS0_IT);
        devpriv->ai_count = 0;  /* stop and don't transfer any more */
-       status = readw(dev->mmio + LAS0_IT);
-       overrun = readl(dev->mmio + LAS0_OVERRUN) & 0xffff;
+       readw(dev->mmio + LAS0_IT);
+       readl(dev->mmio + LAS0_OVERRUN) & 0xffff;
        writel(0, dev->mmio + LAS0_ADC_FIFO_CLEAR);
        return 0;
 }
-- 
1.7.10.4

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