The if and the else branch code are identical - so the condition has no
effect on the effective code - this patch removes the condition and the
duplicated code.
Signed-off-by: Nicholas Mc Guire <der.herr@xxxxxxx>
---
Patch is against 3.19.0-rc4 -next-20150116
This patch was only compile tested with x86_64_defconfig + CONFIG_STAGING=y
CONFIG_COMEDI=m, CONFIG_COMEDI_PCI_DRIVERS=m, CONFIG_COMEDI_RTD520=m
commit c5930d66 (staging: comedi: rtd520: use the comedi_device 'mmio'
member) introduced the current code, the probably bug was though
present before this commit:
if (devpriv->xfer_count > 0) /* transfer every N samples */
writew(IRQM_ADC_ABOUT_CNT, dev->mmio + LAS0_IT);
else /* 1/2 FIFO transfers */
writew(IRQM_ADC_ABOUT_CNT, dev->mmio + LAS0_IT);
as the if and else branch are identical but the comments indicate that
they are serving different purposes this looks like a bug. The code has
though been in use in this form for more than 2 years - so maybe the
condition is simply unnecessary. In any case this needs a review
by someone who knows the details of the driver - the below patch
is only cleaning up the current situation and may thus be wrong.
...and how did this pass multiple modifications and reviews ?...
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 06ae436..3ccdade 100644
--- a/drivers/staging/comedi/drivers/rtd520.c
+++ b/drivers/staging/comedi/drivers/rtd520.c
@@ -1012,10 +1012,8 @@ static int rtd_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
readw(dev->mmio + LAS0_CLEAR);
/* TODO: allow multiple interrupt sources */
- if (devpriv->xfer_count > 0) /* transfer every N samples */
- writew(IRQM_ADC_ABOUT_CNT, dev->mmio + LAS0_IT);
- else /* 1/2 FIFO transfers */
- writew(IRQM_ADC_ABOUT_CNT, dev->mmio + LAS0_IT);
+ /* transfer every N samples */
+ writew(IRQM_ADC_ABOUT_CNT, dev->mmio + LAS0_IT);
/* BUG: start_src is ASSUMED to be TRIG_NOW */
/* BUG? it seems like things are running before the "start" */
--
1.7.10.4
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