Messages in this thread | | | Subject | Re: [PATCH -next] staging: comedi: dyna_pci10xx: remove set but not used variables 'chan' and range' | From | Ian Abbott <> | Date | Sat, 6 Apr 2019 11:13:37 +0100 |
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On 06/04/2019 04:07, YueHaibing wrote: > Fixes gcc '-Wunused-but-set-variable' warning: > > drivers/staging/comedi/drivers/dyna_pci10xx.c: In function 'dyna_pci10xx_insn_write_ao': > drivers/staging/comedi/drivers/dyna_pci10xx.c:109:21: warning: > variable 'range' set but not used [-Wunused-but-set-variable] > unsigned int chan, range; > > drivers/staging/comedi/drivers/dyna_pci10xx.c:109:15: warning: > variable 'chan' set but not used [-Wunused-but-set-variable] > unsigned int chan, range; > > They are never used since introduction in commit 16a7373a8e14 ("Staging: > comedi: add dyna_pci10xx driver") > > Signed-off-by: YueHaibing <yuehaibing@huawei.com> > --- > drivers/staging/comedi/drivers/dyna_pci10xx.c | 4 ---- > 1 file changed, 4 deletions(-) > > diff --git a/drivers/staging/comedi/drivers/dyna_pci10xx.c b/drivers/staging/comedi/drivers/dyna_pci10xx.c > index 9bdd5bf2eb99..d38bfc6113e8 100644 > --- a/drivers/staging/comedi/drivers/dyna_pci10xx.c > +++ b/drivers/staging/comedi/drivers/dyna_pci10xx.c > @@ -106,10 +106,6 @@ static int dyna_pci10xx_insn_write_ao(struct comedi_device *dev, > { > struct dyna_pci10xx_private *devpriv = dev->private; > int n; > - unsigned int chan, range; > - > - chan = CR_CHAN(insn->chanspec); > - range = range_codes_pci1050_ai[CR_RANGE((insn->chanspec))]; > > mutex_lock(&devpriv->mutex); > for (n = 0; n < insn->n; n++) {
That seems fine, thanks. The lines being removed appear to have been copy and pasted from dyna_pci10xx_insn_read_ai(). The AO subdevice supports a single range, so no 'range' code is needed. I believe the card has only one analog output channel[*], so the 'chan' is irrelevant. This means the 'n_chans' value in the AO subdevice configuration is incorrect. I'll send a follow-up patch to correct that after Greg KH takes this one.
[*] Very little information seems to be available about this card online. It is no longer listed on the manufacturer's web-site and I couldn't find any archives on archive.org. I found part of a scientific paper <http://shodhganga.inflibnet.ac.in/bitstream/10603/150646/15/15_chapter%205.pdf> which describes the card as having a single channel D/A converter.
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
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